We too have a challenging driveway rise. If the dealer you are working with is local, get him to bring the unit you like and let him be the first to back it in. We did this and tried 2 units before we found one that would clear without bottoming out. We told him if he could get it up the driveway he had a sale---that was motivation for him to bring the fivers by our house. Obviously we compromised floor plans, features, etc. But in the end wound up with a unit that has worked for us.
It was a "must" for us to be able to park in the driveway to pack, do maintenance, winterize, etc. We store it in a covered location, but would not like to be in a situation where we can't park at the house. Good luck!!