So, three weeks in the Keys would cost ~$7500 at a Courtyard for one king room.
Very nice campground cost $2500.
I'd drive either way. Tolls and fuel increases about $1000 RT with the camper.
Kids and family can come down for a few days. I don't have to pay for another room with the camper.
Food is cheaper.
The difference in just lodging pays the payment for the brand new rig, so I'm going to break even on the first trip. Last year, I was money ahead.
We do this trip twice a year. There is no way that it would be cheaper to take both trips without the camper.
The intangibles of being in your own "home" and sitting outside with friends and family are just a wonderful bonus.