Condolences.
I cannot fathom what you are experiencing, but I can relate what happened to my father when my mother passed away. They were avid RV'ers and while the TT never moved again my dad went on living a full and active lifestyle. He met a very nice lady and their travels were more of the get-on-a-plane and go to Hawaii, Alaska, Florida, etc...
I agree with others to hold off on selling the RV. Perhaps it may come back into vogue for you. God has a plan for all of us and I wish you peace.