I believe the frames are lighter weight. And I think smaller axles are used to allow for a lower GVWR.
But both are guesses.
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Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
The frames are smaller, therefor lighter. Frame work dinette and other storage is made from square aluminum tube. The cabinet frames are made from wood that is so light it almost floats in mid air. I do a lot of wood working and I have no idea what kind of wood it is. It also has very little holding power with fasteners. Cabinet doors are a light weight fiber board.
I can't complain much about my V-Lite. I've probably put 30,000 miles on it. The bad roads we all have to drive on have required me to make some creative repairs for cabinets and drawers. I know the frame is smaller especially behind the axles. I'm surprised FR hangs the spare tire on the bumper.