It would be tight
I don't think you can use the motorhome to launch the boat. It will be to tight.
60+ feet is a little long but it is a big area so might work. There are slips there but don't know rental terms.
There is slip space near the ramp (though i think it might be free) could be rental though. Regardless there is space. The ramp is a long downhill ramp with a slight curve. The boat wouldnt be a problem but additionally with the motorhome it could be doable but definitely a challenge. A truck would be much better, but if you have gotta make due then good luck!
You should be fine getting your boat down there and I believe you can rent slips.
Thanks! Your answer is awaiting moderation.