Sale By Owner or Trade-In? Value?

I own Fleetwood camper and the manufacturer is no longer in business.
Getting small parts is a hassle as they often are unique and not sold by CW.
Selling privately is lot of hassle.
I am trying to sell my vintage Prevost for over a year and fully useable, updated coach for $20k is good price, but all I got are lot of tire kickers.
I spend tens of hours showing it in the storage and one potential buyer paid $120 registration to get a test drive, but no buyers.
So unless you really have lot of time to spend, take the trade offer.
Too many people in this World have no idea what they want and will not hesitate to waste your time doing so.

What dealer told you FW is no longer selling? A local Winnie dealer once told me Thor was no longer in business. Where do they get these guys?

Anyway, you will be lucky to get wholesale on a trade - period. There is a lot of work with little to gain on taking on used units for a dealer especially one that's 8 years old. Not to mention you lose any negotiating power to drive down the price of a new unit from MSRP. I was going to trade my ACE on a newer model, quick deal, it's only a year old, and my dealer flat out told me I was better off in a private sale. He said he would love to have my business but he would only give me wholesale and that advertised price on a new unit would go up. I appreciated his honesty.

Bottom line, always better to sell privately and go into a new purchase with no trade. You'll get more for the old one and save a lot on the new one. The exception maybe going to a very high end unit with a larger profit margin. But then if you have that kind of money you may not care about losing so much on the old one to avoid the hassle of doing it yourself.

When I sold our last mh several years back, I looked for similar units online and also checked the RV prices on nadaguides.com, using the lowest retail without options to figure an approx value if I sold myself. For trades, after you factor in the difference in sales tax on trade and also an amount of cushion for the "pain in the neck" factor of selling it yourself....you may come up with what would make sense. For example, if you could sell it yourself for $40k but could get $35k on trade, assuming a 7% sales tax rate that $35k is actually worth $37,450 to you. So the question would be, is the remaining difference of $2,550 worth it to you to have it gone and not have to deal with selling it? I know your numbers would be quite different, but that gives you the thought process I went through.

This is a tough one.
It is going to depend a LOT on the area you are in.
In Florida, for example, there is a GLUT of new and used units and prices are WAY down......in general.
I've heard that is not the case "up north" in some areas.

I suggest that you shop around in your area; both physically and online searches. When you determine what the common asking price for a similar unit IS, retail, then you can better figure what you can expect the value is for a private sale or trade.

And you mentioned detailing and cleaning.
That is on YOU. A consignment shop is not going to do anything to it unless you pay them. And a unit that LOOKS bad might be next to impossible to sell. I certainly quickly bypassed several that looked ratty on the outside when I was shopping.

That is very strange because Fleetwood RV seems to still be selling RVs now: http://fleetwoodrv.com/

Another consideration in your thought process.

Here in Idaho we pay sales tax on the "difference" when trading in a vehicle. That can amount to a considerable savings in tax dollars. If you purchase without a trade-in, sales tax is based on the entire amount of sale.