Never had big diesel. Thinking of letting go of my 2016 RAM 2500 diesel because I pull a 36 foot fifth wheel camper. However, I can't stand the thought of driving a 3500 long bed dually to the store and around town. If I go single rear wheel am I going to feel much of an improvement over the 2500? Also I'm reading the newer (19+) 68 trannies aren't as problematic as they were, is this true if I can't find a Aisin? Jump on a good deal or wait until new trannies come out which puts me hauling with my 2500 for a few more years? Thanks