So you are going to basically "park" the TT at one campground? Then just have it delivered there. Either the dealer, or the campground, will know people that can do that either for a fee (probably from the dealer) or for free (campground may know people who can help out).
I was going to say don't worry about it for one short tow from dealership to campground, but then you said 250 miles. That is a long way.
Is there a dealer closer to the campground who has the same model camper?
Also, contact the campground - they may have perfectly good seasonal "park model" campers available. Park models are usually set up more like a house, and usually are more comfortable for long term stays.