Can anyone give me any advice on choosing the right chipper. I need something that can be towed behind a 2500 pickup. Now I've towed some pretty massive chippers for my previous employer with his 3/4 ton but we didn't use his pickup for the chips. I think between a full bed of chips and the weight of the chipper I might want to consider something small. I was hoping to go with a 6" self fed. I would imagine disc is lighter. Also, I'm looking for a used machine if anyone knows where I should start looking. I don't need anything too big. I have a 20 ft flatbed trailer with crane and hoist on tongue for logs.