Hello, I'm looking at gettting a new rolloff unit for a new dumpster business we are starting. I will also get a flat body and use it to move my skidsteer and wide area mowers, etc, from time to time. I'm looking a new pre-emission Volvo VHD units. Option 1: 20K front 44 rears, GVW 64K with 4.10 gears and 22.5 tires. Locking differentials both rears. Option 2: 20K front 52 rears, GVW 72K with 4.30 gears and 24.5 tires. Locking diff last axle only. For some reason, on the 52 rears Volvo only offers locking on the last axle. Am I that much more likely to get stuck? I know, you have to use common sense about where you take your truck. But my concern is rolloffs find themselves on some of the nastiest mud on jobsites, and pulling away from a dumpster unloaded in the mud.....I'm concerned. Any thoughts? I really like the idea of the heavier gross and 24.5 tires but don't want to ruin half a day and pay $500 tow bills very often.