Hi trent to get $5-$6000 it would have to be in really really good condition !! I have seen a few I was looking at buying one for ca18 transplant. Most I looked at where too rough with rust in the usual places or modified (butchered). prices varied from $500 -$3000. I would personally keep yours as they are different and a bit more roomy than a ute as least you can put the seat back a bit in the wagon. and carry more than two people.
cheers Andrew