Ok - Lets compare launching with a RV VS a Suburban.
When the hitch is near the rear bumper, do you get the rear bumper wet with the Suburban? The hitch ball to bumper length is the same with the Super C and the Suburban. . .
So they will both launch the same way. Just you will have dual wheels with the motorhome. Many launch boats with motorhomes. If you have a back up camera, it REALLY helps, because the boat might be skinny compared to the width of the 102" wide RV.
Your transmission should have park in addition to using the parking brake. Yes it will hold on a boat ramp!
Have fun camping!
Fred.