I have a 1990 GMC 2500 4x4 pickup for sale. It has a 275 Deweze bale bed that functions as it should. My wife's grandfather bought this truck new in '90 then installed the bale bed in '91. I bought it from him in 2010 and have spent a good bit of money on it. I replaced the leaf springs, spring perches, shocks, struts, rotors, pads, drums, shoes, fixed the e-brake, replaced the starter, fuel pump, alternator, slave cylinder, and various hoses on the bale bed. I replaced the 275 arms with the newer 475 arms a couple of years ago.
The bale bed works, the heater works, the 4x4 works, and it starts every time you need it to no matter how cold it is. It isn't perfect; it's a 20+ year old farm truck.