I have done a search on this forum and I haven't found really any clear cut answers about a tank for the rear of a 77 ford F250 highboy. I do know that highboys had the in cab tank which I want to get rid of and place one behind the rear axle. There are different answers to if the 33 gal tank out of a bronco works. Does a bronco tank fit between the frame? Also, I checked out aerotanks.com. Does the 32 gal aux tank for 70-85 trucks part # 1028 work? Has anyone put that in their vehicle? What was the cost?