Ron thanks fro the reply. I have two trailers now. I have a open 7 x 16 tandem and a enclosed 7 x 12 single. I never had work in the winter time before that is why I bought the open trailer. I now have work lasting through most of the winter and I am switching to an enclosed trailer. 7 x 16 tandem custom built. I am getting 12" cross members instead of the 24" I am getting two side doors installed one on each side. Directional air vents, 1/2" side walls, 5200 lbs axles, installed baseboard heater with thermostat , two roof vents, back up lights, inside lighting, extended axles so I have no wheel wells inside, ladder racks with a mounted ladder to get up to the roof, 4 way brakes, double rear doors, breakaway kit, and a couple other odds and ends. I know all about the water. I can haul up to 550 gallons now. I hardly ever drive with that much weight. I wash cars and what I do is show up half full and start washing and hook up to water. When I get what I need I wind up the hose and finish the lot. I am usually only pulling my rig full around a parking lot. By the time I leave I have about 50 gallons left in each tank. I was just wondering which way to go on the axles. I think I am going to go with the spring axles. Easier to fix and they are a total of $380 cheaper. Thanks for the help. By the way I got all this on the trailer for around $4500 brand new. This place has some good deals on trailers. The basic 7 x 16 enclosed with tandem spring axles is $2985. With that you get breakaway kit, 4 way brakes, double rear doors, and 3/8" walls. You have to add all the options.