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Message: [QUOTE="Tree Trimmer, post: 1418416, member: 716"] i gotta '10 450. we built a dump box for it. like 10' long, and just wide enough to cover the tires. full of dirt, with a skid loader on a trailer we weren't close to bottoming out the suspension. yes, their pigs. i also have the 19.5's on mine to. what we did, was load it to the gills with what we thought would be the most we would ever put in it, not plumb full, but you get my drift, and then let out air pressure in the rear till the tires had about a half inch till they touched each other. your inner and outer duals on one side. and that is your new tire pressure. as a tree trimmer, mines either parked not being used that day, or loaded. rarely is it empty unless its traveling to get loaded or traveling back after having dumped. you decide how much pressure you need in your rears for yourself. whatever you decide on, if you go with a lower pressure just make sure you keep a close eye on the spacing on your duals. if you go with a "ride quality" pressure instead of a "work" pressure, and then load it, if your two tires touch cuz you forgot to air them back up the tires will get fking hot and tire wear will accelerate. my learning experience for you, lol. as for the fronts. on my rears, the axle is almost centered in my dump box. to the rear some, but pretty much centered. as such, the rear carries a vast majority of the load, very little of the load itself is carried on the front. so instead of changing springs, let air out of your front. i think my tires call for 90# or something, and i got like 65-70 in them. it was a huge improvement. keep a eye on front tire wear if you do let air out, as if it looks like it's wearing more on the outside of the tread and not the middle, you let to much out your running on your side walls. put some air back in. but if you think your going to make this truck ride like a SRW, i want some of what your smoking. lol. it's a pig and will ride accordingly. though it can be improved some. [/QUOTE]