Hitch mounted motorcycle carrier on class c

I have a 40-pound aluminum hitch rack as sold on Ebay. I have a 188 pound Honda Trail 90. Our 27 foot Tioga handles OK with the rack and trail bike on the back but steering feels somewhat lighter. The same combo on a 30 foot rig would probably make steering feel considerably lighter. A 400 lb motorbike or scooter on an even heavier rack will likely make steering too unsteady. I have carried the same Trail 90 on a front rack but that is not ideal. Access to the truck engine with bike in front is limited, straps and clips tend to abrade the hood, headlights are blocked, airflow to radiator may be reduced. A lighter rack and lighter electric bike, etc. may be more practical. I carry a portable electric mobility scooter in the cargo bay of our rig currently. Folding bicycles are another option.