If I could turn back the clock and do it all over again knowing what I know today, I would've gone straight for an Outdoors RV TT. Lot's of good reasons why, starting with their in-house built, heavy duty frame. Just think, no Amish craftsmanship to worry about either...
Go to an RV show and look at any of Northwood's TTs and compare their frame to a Lippert one on other brands. Lance uses the BAL/Norco ultraframe but don't know if they stand up to off-road use.
Northwood claims their frames are off-road certified by an outside independent company but to what standard and by who?
If your Lippert frame fails, even if still under warranty, it'll be your fault not theirs. Their standard excuse is that you overloaded it. We had a bad frame on a previous brand new TT and Lippert said "it's within spec." Shortly after owning it, we had it inspected by a gov't certified inspection facility who condemned it which resulted in the TT being taken back by the dealer. You'll never get that kind of cr*p with an Arctic Fox.