Hard to fix stupid although I once got hung up trying to get into a friends driveway with a good dip in it. Hitch dug in enough so the drive tires spun and I had already manually raised the coach up using the air leveling... now what? I manually raised just the back and lowered the front and this gave the drive tires enough traction to go ahead. It also proves the hitch is stronger than it's rating.
I've stayed in the CA Maritimes and CA Rockies without any problems other than 15 amp service... if they had power and not that big of a problem. Some turns require that you wait too late to make the turn and then back up... a two point turn.
Now that you have bullet proofed your 6.0 and with four kids I'd keep what you have. Most large DP's are not setup to sleep 6.