I rejected the Canyon, Colorado, Traverse and Acadia for exactly the reason you have now experienced. Not adequate to tow my 2015 Winnebago 2101DS. Your only option is to move up.
"of course we were told this truck would work."
There are some you listen to closely and follow their advice. Then there are RV sales people where you verify everything they say.
Winnebago 2101DS TT & 2022 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AH Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad