Yes, you have to move FAST! We sold
a couple of months ago, sold in four hours, and we had several people that wanted it. We have bought two molded fiberglass trailers. In both cases, we bought on day ONE, and the seller had multiple people ready to buy. Needless to say, you can pretty much forget negotiating on price.
If the trailer is priced appropriately, they go super fast. There is no time to wait for the weekend, or when it is convenient to go see it, or whatever. It WILL be gone by then!
Given the long backlogs from all of the manufacturers, people that want a camper NOW have no choice but to go used.
I've had one where the seller got offered over asking price and reneged on what I thought was an agreed upon deal. Its how it goes. "Dibs" means nothing! First person with cash wins.