1st timer, please help! Best RVs 34-40' under $350k ??

OK, so you want top end new rig. Tiffen is good, Newmar is good. There is multiple models built from top quality to get the brand and not the top quality. Most have similar drive train engines and transmissions.

Your quest is to determine where you want to slide into the market, new or slightly used perhaps, and learn to live in the $$$$slide you enjoy as they depreciate. Spend the time to look at floor plans and engine options, and figure out where your family and future looks best.