sledge&wedge
ArboristSite Operative
I don't know if you ever came up with anything but paging through the latest sportsmans guide I noticed these.
http://www.sportsmansguide.com/prod...MTIjwgBfX0RmaEG3PrRuw6IgrS7G4qEDCIaAluD8P8HAQ
http://www.sportsmansguide.com/prod...-front-rear-cargo-basket-set-2-piece?a=580319
I had the racks from the second link you posted on my old fourwheeler. They were nice for hauling fairly light stuff around; treestands, tools, etc. but they wouldn't handle anything with much weight to them. They attach to the racks with U-bolts (used to, anyway) and no matter how tight you crank them down, adding anything heavy would cause them to twist around and get loose after a short ride. Not only that, but they would scratch the hell out of your existing rack. Not trying to bash your idea, just don't want someone else to end up like I did.