If you are over GVWR and or GCWR....even by 100 #s you are operating in a degraded safety environment. Empty tanks. Jeep toad. The simple solution is to take all your "stuff" out of the RV and the Jeep and lay it all out on the tarmac. Go through every item and chuck out what is redundant, unnecessary, not relevant to the "mission" (e.g., your Speedos when you are going North in the winter), the three parkas when one will do. Feather weight every item. Ditch the Wedgewood china for paper plates and plastic ware. You don't need quarts of oil or gallons of DEF. Buy that stuff when you need it. Empty the Jeep!!!
Shedding 100lbs? Should not be a problem. Traveling without a spare? A problem.
I'd not travel without the spare.