I couldn't find any written documentation on Keystone's website. My experiences have been with the newer units, a single piece sidewall is "vacuum bonded" to an aluminum frame, and the steel sidewalls are stapled to a wood frame.
Looking at the Hideout section of Keystone shows the steel on the TT's and the Vacuum bonded sides on the Fifth wheels. Is one better than the other? The Aluminum frames are lighter, but any damage to the sidewall requires some serious body work. It's not hard to pull and replace the steel panels, but it doesn't take much leaning on them to "dent" them. I've had both and prefer the lighter aluminum frame and one piece sidewalls.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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