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Old 07-01-2012, 06:51 AM   #11
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Full tank all the time for me you never know when you might need some water. Weight is not a big deal for me

Dave & Shelley GMC Ext cab Dually 4x4. Duramax Deisel.Allison trans.2010 Jayco Eagle superlite 31.5 RLDS 5er.
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Old 07-01-2012, 11:48 AM   #12
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Location: Luray, VA (central Shenandoah Valley of VA)
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Since we camp mostly at CGs with full hookups, my vote goes with about 1/3 full in FW tank. We live in a valley between two mountain ranges, and have to go up one or the other to get out, so it helps the truck with about 300lbs less weight to pull up the hill. Every bit helps. We have very good well water at home, and usually take containers of it to drink, and use city water for dishes, showers, etc. at the CG. When we leave, we flush out the city water with our own from the FW tank, and have never had a problem, even when the system sits for several weeks between camping trips.

2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
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Old 07-04-2012, 10:54 PM   #13
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Location: Victoria, British Columbia, Canada
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Generally empty - but it depends where we're going. We keep a 4ltr jug by the toilet for those road-side-stops, and another in the kitchen for drinking (just in case).
If we're boondocking locally, we bring in water. I also keep the fresh water tank full in the trailer when it's parked in the driveway - that'll give me 5 days of water in an emergency (west-coast living=major earthquake expected...not that I'm paranoid or anything...).
3 kids and Buddy the Dog;)
Victoria, BC

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Old 07-05-2012, 10:52 AM   #14
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We generally have at least 30 Gal in our FW tank (holds 90). You just never know when it might come in handy and it has no effect on our gas mileage or towing characteristics.
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Old 07-18-2012, 08:50 PM   #15
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Location: Fairbanks
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Here in Alaska, the few times I've used our new trailer--we prefer our own water. So full FW tank.

2015 GMC 3500HD SRW 6.6 CCSB (Daily Driver/TV)
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Old 07-19-2012, 04:51 AM   #16
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I only tow with a full fresh water tank when I'm going to a boondocking site and I don't want to have to fill with water from a gas station or some other unknown source.

2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof
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Old 07-19-2012, 03:24 PM   #17
Join Date: Feb 2012
Location: Ontario, Canada
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I don't have enough experience with my trailer yet, but had lots with my 31 foot motorhome. I got about 10 mpg with it with a strategy of 1/2 full FW tank and run the gas down to 1/4 tank and then fill.
I had a problem once (couldn't fit in the gas station) and couldn't fill at 1/4 and had to run it down to 1/8. The rig handled beautiful with the less weight and didn't drop out of overdrive as often.
I then began going down to 1/8 and filling to 3/4 only. I improved my gas mileage by 20%, up to 12 mpg and it kicked out of overdrive only 10% of the time it did previously.
With my 26 footer and Suburban, I've seen wind make a 20% difference, but I haven't had it on the road enough to determine the gas difference with less fuel/water.

2012 Jayflight 26RLS
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Old 07-19-2012, 08:05 PM   #18
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We only carry around 10 gallons for flushing and doing a few dishes.
2011 Eagle 330RLTS with just about every option.
2017 Silverado 1500 4x4 5.3 with tow package.

I was born with nothing and I still have most of it left.
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Old 07-19-2012, 08:12 PM   #19
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It's full when going dry camping and almost empty when going to a campground with water hookups. My X17Z only has 30ish gallon tanks, so it's only a few hundred pounds with the fresh water filled.
2010 X17Z behind 2010 F150 supercab
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Old 07-19-2012, 09:03 PM   #20
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Originally Posted by Partyof5 View Post
snip.....I always thought it wasn't smart/safe to tow with a full drinking water tank. What are your thoughts? I am driving cross country next week, so I am curious.

Well, you must have better then half your cross country trip behind you by now

I avoid towing with a full fresh water tank whenever possible. My WDH is dialed-in based on empty tanks, and my fresh water tank is located at the rear of my TT so when filled it compromises my desired tongue weight.



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