It is only worth what someone is willing to pay for it.....not much help I
know.

What kind of RV is is"  I had a trailer that U haul made.  It is called a
Burro.  It looks like two egg halves with a seam running down the middle
horizontally.

It was small, but a good little camp trailer.  I bought it for $200 from a
friend who wanted to dump it.  I had to drive 200 miles and back to go get
it from where it was.

I sold it for $4300 on ebay.  Yes, FOUR THOUSAND THREE HUNDRED DOLLARS.
They are in demand because they are light and can be towed with a light
vehicle.

Look at Casita, Burro, Scamper on google, and in ebay completed items sale.
If it is one of those, it is worth some cash.

Steve