A belated; Welcome to iRV2.
First question would be ; Does your home state have a " Lemon Law " pertaining to RVs?
If not , I think you should go after the dealer and factory for a year extension on the warranty, or at the very least on the slide and frame.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.