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Old 08-02-2018, 08:03 PM   #1
Junior Member
Join Date: Jun 2018
Location: Brentwood
Posts: 7
Will it fit??? to posting but have read so many great and informative threads. We have a 2018 28.5 RSTS which came gen prepped. It seems many people use the Cummins Onan 5500 and our gen prep looks specific to LP fuel. The deminsions of the front bay opening and the height of the 5500 seem incredibly close, like a fraction of an inch with the bay only minimally larger. Has anyone put the 5500 LP in this particular unit? It would stink to order it only to find it wont fit. Thanks so much !!😀
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Old 08-02-2018, 10:34 PM   #2
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Join Date: Apr 2018
Location: Selah
Posts: 17
I would say yes. We purchased a 2018 27.5 RLTS gen prepped.
Did the dealer install, Onan 5500LP. May be an overkill with a single air.
I dont regrett it but it does add pin weight. Its alot of gen for making coffee.
Paul and Ronna
Selah Wa
2018 Jayco HT 27.5RLT w/ Onan 5500LP
2010 Ram 3500 Crew SB 4x4 w/timbrens
Raceme tuning and some deletes
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Old 08-03-2018, 04:41 AM   #3
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Location: Saint Thomas, PA
Posts: 2,223
The Gen prep is designed for the Onan 5500. So yes, it will fit. We installed one in our 2017 Eagle 293rkds. I put sound deadening material in my compartment prior to installing. I also added a couple more CO detectors.

2017 Eagle 293RKDS, factory ordered, lots of mods and upgrades. More than I can list.
2018 Ram 3500 crew cab long bed SRW diesel 6spd Aisin 4wd Tradesman.
B&W Ram puck 5th wheel
Line-X premium
Mopar wheel to wheel steps
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Old 08-03-2018, 08:28 AM   #4
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Join Date: Jun 2018
Location: Brentwood
Posts: 7
catzr...Thank you. We added a second AC so, based on all I've read, we believed the 5500 was the best way to go. Hard to say though because the darn thing is in the shop already after only going on a shake out two-night, three-day trip. We "shook" it out all right. The AC's would only blow hot air and the outside temp was about 101 deg F. The inside temp of the rig seemed hotter than outside so our trip quickly turned to an overnighter. Once at the shop, we learned that the AC's will only bring the interior temp down about 20 deg. Still, 80 deg would be far better than the over 100 we sat in inside.
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Old 08-03-2018, 12:09 PM   #5
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Join Date: May 2016
Location: Cincinnati
Posts: 701
Ours was gen prepped and we just had a 7000 gas put in (yes, it was gas prepped). Fit perfectly.
Dennis & Donna Dohme
2016 36FBTS Pinnacle
2008 F450
USMC Veterans (both of us)
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does gennie fit, onan 5500

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