Sell truck and camper together or separately?

I recently shopped my trailer truck combo at rv dealers and they came close to the trade in value I had wanted but said they would not keep the truck, saying they are not in the truck business and would wholesale it out and sell the trailer on their lot . They said most people already have a truck when they are shopping for a trailer and it would sit to long trying to sell as a combo. Selling it privately you may find a buyer that's wants both . the four dealers I had gone to all said the same thing.