Had an 18' Sea Ray we towed all over California - especially to Lake Shasta from Temecula - with a 27' Class C. Then a 21' Sea Ray we pulled with a Class A. Motorhomes are superb tow vehicles. First off, if the ramp has the appropriate amount of slope, you will not get your back wheels wet as was often the case with the vans, Grand Cherokee & Tundra I also towed with. Do not submerge any part of the RV to launch! On long steep ramps often found in N Cal late summers, do not be tempted to nose down & make a U-turn to launch. Motorhomes are too top heavy even though it can be carefully done. Just back down slowly. Don't put a hitch on the front of the RV! You need the weight over the drive wheels! Backing up with a narrow trailer is a problem. Now . . . To get to the essence of your question. Wherever possible, I rented a slip for the boat. Launch when we arrived, retrieve days later when we departed. When dry camping in the Class C, with no slides or jacks, not a problem if no slips were available. With the A's 2 slides & jacks, I personally would have been unwilling to break camp to launch & retrieve each day. Cal for the most part is lacking in quality RV facilities close to good boating areas. What I've seen of the south, it should not be hard to find a nice RV park within easy walking distance to a marina with slips for rent. I would absolutely have to have a way to leave the RV in place with the boat in the water the whole time I was there.