Looks like a fair price.

“WWII Converto brand dump trailer that was towed behind the jeeps for construction work on the islands for runways and the like. It is in excellent condition except for the tow hitch as the eye was removed and a fork hitch installed. Original tailgate and data tag. To operate you pull the lever for the tailgate (with rope from jeep or tractor if you want), then you pull the lever for the dump lock. It is engineered to dump via gravity, very simple and rugged.

What can you buy today for a dump trailer of this high quality and historic value for this price?”

https://cnj.craigslist.org/grd/6108635178.html