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Old 09-25-2017, 11:16 AM   #1
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Purpose of the enclosed underbelly?

What is the main purpose of the "enclosed underbelly".
I originally thought it was part of the thermal package until I saw a new 2018 RSBS with the thermal pkg (had the sticker by the door) but it did not have the underbelly enclosed.(unless the dealer took it off for access?)
I noticed they are not "totally sealed", meaning critters such as a mouse could make his way in there pretty easy.
I think I heard that it makes it a bit more wind friendly while traveling(not sure that makes THAT much of a difference).
Don't get me wrong, I like the appearance and the whole idea of an enclosed underbelly.
But if a mouse gets in there, how do you get um out?
How do you access to get to problem areas(leaks)?
Do you take the whole thing off? Does it start sagging after time?
Does it rip easily?
Has Jayco been doing this for a long time or is it fairly new?
So, back to original question, what is the main purpose of it?

Thank you
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Old 09-25-2017, 11:21 AM   #2
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Quote:
Originally Posted by bluegill1 View Post
What is the main purpose of the "enclosed underbelly".
I originally thought it was part of the thermal package until I saw a new 2018 RSBS with the thermal pkg (had the sticker by the door) but it did not have the underbelly enclosed.(unless the dealer took it off for access?)
I noticed they are not "totally sealed", meaning critters such as a mouse could make his way in there pretty easy.
I think I heard that it makes it a bit more wind friendly while traveling(not sure that makes THAT much of a difference).
Don't get me wrong, I like the appearance and the whole idea of an enclosed underbelly.
But if a mouse gets in there, how do you get um out?
How do you access to get to problem areas(leaks)?
Do you take the whole thing off? Does it start sagging after time?
Does it rip easily?
Has Jayco been doing this for a long time or is it fairly new?
So, back to original question, what is the main purpose of it?

Thank you
On most trailers with an enclosed underbelly, they direct part of the heat into the underbelly to prevent water pipe freezing.
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Old 09-25-2017, 11:58 AM   #3
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The underbelly can be made water intrusion and mouse proof from the outside, but there is still a door or you can bring it in with goods. But its main purpose is to extend camping experience. I wouldn't want myself a RV without underbelly, just because of road debris etc.
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Old 09-25-2017, 12:44 PM   #4
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The underbelly can be made water intrusion and mouse proof from the outside, but there is still a door or you can bring it in with goods. But its main purpose is to extend camping experience. I wouldn't want myself a RV without underbelly, just because of road debris etc.
After 5 years and 25K miles not a cut or hole made by road debri in the underbelly. The only ones are the holes that I made for SOLAR, Wi-Fi cable, and Cellular booster antenna cable. Maybe I am just lucky. Believe me there was a lot of road debri out there....

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Old 09-25-2017, 01:07 PM   #5
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Many reasons.
Most larger rigs have the tanks and water lines inside it with a heat duct that should keep it from freezing if you have your furnace running.
EDIT: Mine has the Glacier pkg.

My rig has 3 rather large holes that came from factory so that I can access the parts that are prone to need access.

I like the fact that road/ mud spray does not coat the underside when towing.

There is thind foil insulator on mine above the underbelly material. If it's Coroplast, it's pretty sturdy against rocks and such.

Most people get some spray foam and seal the small cracks and places that could scoop air when underway. We have never had a problem with mice with this rig. Not so with my last one. Don't put out rat poison and don't ask me how I know.
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Old 09-25-2017, 01:19 PM   #6
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Purpose of the enclosed underbelly?

Quote:
Originally Posted by bluegill1 View Post
What is the main purpose of the "enclosed underbelly".

I originally thought it was part of the thermal package until I saw a new 2018 RSBS with the thermal pkg (had the sticker by the door) but it did not have the underbelly enclosed.(unless the dealer took it off for access?)

I noticed they are not "totally sealed", meaning critters such as a mouse could make his way in there pretty easy.

I think I heard that it makes it a bit more wind friendly while traveling(not sure that makes THAT much of a difference).

Don't get me wrong, I like the appearance and the whole idea of an enclosed underbelly.

But if a mouse gets in there, how do you get um out?

How do you access to get to problem areas(leaks)?

Do you take the whole thing off? Does it start sagging after time?

Does it rip easily?

Has Jayco been doing this for a long time or is it fairly new?

So, back to original question, what is the main purpose of it?



Thank you


Yep, the underbelly should be sealed pretty good, because they shoot a duct from the furnace down there. I have emperically verified that the underbelly with a duct drops my freeze protection to 22 degrees F ambient.

Jayco sealed mine very good with spray foam at all the penetrations.

I've never had mice issues, but I also keep an ultra sonic pest repellent plugged in 24/7.

I would prefer to install tank heaters but haven't "needed" them bad enough to drop the coroplast.

I wonder if the "thermal" package is different than the "glacier" package; one having enclosed belly the other not?


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Old 09-25-2017, 01:25 PM   #7
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I originally wanted the underbelly (this is my first trailer) for cold weather camping but could not dish out the extra money at the time.
Now after reading everyone's experience of not having access to underneath I am glad I don't have it. Too many times we have to check things underneath.
Once my fresh water tank had a metal bracket fall off - with the underbelly I could not see what is happening. This also applies to everything else under trailer.
I plan on having a welder fabricate a bike rack, underbelly would deny access.
Several people have had grey water tanks fall off while camping, again underbelly would be a hindrance
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Old 09-25-2017, 02:10 PM   #8
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Originally Posted by kayakterp View Post
I originally wanted the underbelly (this is my first trailer) for cold weather camping but could not dish out the extra money at the time.
Now after reading everyone's experience of not having access to underneath I am glad I don't have it. Too many times we have to check things underneath.
Once my fresh water tank had a metal bracket fall off - with the underbelly I could not see what is happening. This also applies to everything else under trailer.
I plan on having a welder fabricate a bike rack, underbelly would deny access.
Several people have had grey water tanks fall off while camping, again underbelly would be a hindrance
These are very good points and definitely the downside of the enclosed underbelly.
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Old 09-25-2017, 02:38 PM   #9
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From what I can tell the enclosed underbelly when the furnace is one keeps the floors a bit warmer, and the tanks from freezing as soon. I do not have an underbelly on out htt. And have camped with the lows in the low 20's and have not had any tank issues. But the floors, they where mighty cool.

The underbelly should help with aerodynamics, as the whole underside is smooth. Most of the early higher fuel efficiency cars had very smooth undersides. All the hoses, cross members and so forth create a little drag.
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Old 09-25-2017, 04:13 PM   #10
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Not every TT enclosed underbelly is ducted, ours isn't.

But we got it because it still provides thermal benefits in the winter.
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