As far as DRV units go, over the past several years, several dealers are emerging as the 'ones to go to' for a good PDI. As it is virtually impossible to get a perfect unit new nowadays, it falls on the dealer to figure it out and correct what the defects are. If the dealer is simply a 'sell it-forget it' type, the factory shortcomings will haunt you for a long time. Very sorry for your problems but you sure seem to have come to grips with them.
Perhaps all new DRVs ought to be sold with a 'back-to-the-factory' trip voucher?
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired