I bought one of these this summer that is a tube cage that sits on a flatbed (no sheet metal skin on sides or roof. It isn't galvanized, it is painted. I paid $600 used. Don't know if that is good or bad, but it isn't beat up at all just a little minor surface rust. It has worked for me just fine having hauled calves and hogs to the slaughter house. The only downside is it doesn't have any protection from weather, so I only haul nice days unless it is to the locker plant. My kids are grown up and gone so we aren't showing anymore and so I downsized my truck for better mileage and bought the flat bed and this insert. For my uses now it works great and I now have a flatbed trailer that I use more than the 2-3 times a year that I haul cattle.