Rqtpis,
First, know the over all length of your rig as it travels.
You pretty much will have to consider this on a single park basis. Many places have pull-though slips that could accommodate your whole rig as it travels. Most do not.
As I recall, a Prius cannot be towed 4-down, so you need room for it and the dolly.
Those that can accommodate a 40foot coach (In my experience) can also park a towed and dolly. But, you will have to confirm that before you give them money.
Matt
Matt & Mary Colie
A sailor, his bride and their black dogs (one dear dog is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.