[alanmcorcoran]

Some additional thoughts:

1) even with renting, you're not saving any money on lodging. At a cost of about $110 a night for the rv, plus 30-50 bucks a night space rental plus an obscene amount of gas money (think I spent $150 plus the first day) you're easily past motel six territory.
2) there are intangible advantages to the rv. You can take lots of stuff and no packing and unpacking. You can save money on meals. You have a shower bathroom bedroom and a kitchen whenever you want one.
3) you can get some of these advantages without the rv if you "shamrock" tour. (pick an anchor point and do four loops that start and end there) but you can't bring lots of stuff and you might have to rely on restaurants for meals.
4) the rv shines on going places where there aren't places to stay and, if you are resourceful, you can avoid the 30-50 space rental.