In 2003, I flew to Portland, ME, to buy a hard-to-find 6-month-old sports car with 2700 miles on the clock, then drove it back to Ohio. My current truck, I ordered it through a dealer about 200 miles away since they gave me the best price.
But these were new or nearly new, and did not involve trades. I would hesitate to tow a thousand miles or more with the expectation of trading my current RV for a used motorhome.
If a far-away motorhome looked like it would fit our needs, I wouldn’t hesitate to drive or fly there to check it out, and maybe buy it outright.
Wayne