My divorce helped me downsize (everything) :) !
I had to sell my 2014 RAM 2500 and ended up in a 2001 Chevy Malibu and sold the RV. Now I'm back to RV ownership - albeit a small one and a 1/2 ton truck with high miles. I couldn't be happier.
I really enjoy the small RV and the truck. That said, going from a 3/4 ton diesel to a 1/2 ton (gas presumably), the only improvement you will see is in ride comfort and maybe save a little on maintenance. With a 10k tow rating (or more, but realistically 7-8k), you can tow a decently sized RV if you want. So, those are the PROS for swapping.
Buying new vs owning something that's paid for is a bad financial decision generally speaking, but so is owning an RV. Sometimes it's just about getting what you WANT.
I have no regrets about downsizing the truck and RV. In fact, I like the smaller combo much better. Many of the campgrounds we frequent in the Canadian Rockies have a very limited spots (if any at all) for anything over 25 feet long.
If I could change anything, I would rather have a hard sided RV instead of the hybrid, and only because the hybrid gets cold as most nights in the Rockies near the glaciers etc. get down to just above freezing at night.