I have a pair of Rancho 1500 LB overloads that I have used on two F-250s. Easy to install, they just fit over your existing leafs. Using a block over the axle and four really long U bolts, they pull up on and assist your sagging springs. Plus you can adjust them by tightening or loosening the U bolts.
A few points, like the others said, get weighed to make sure you don't exceed your GVWR. 10 plys are a must. And finally, when you have settled in on your normal weight load and your spring tension, have the front end aligned. Any time you change the ride height, it also affects the front end alignment.
Is anyone using a dodge sprinter?? I've seen a few in use with Electricians. Excellant gas(diesel actually) mileage, not sure how much they can carry weight wise?? I'm in a 3500 extended cab GMC with a reading body and I love it except for the 12 MPG. I drive many miles a year so my next vehicle has to improve on that 12 mpg
On my E350, I will be adding airbags very soon. Even without an onboard compressor, you can install them with just a schrader valve and pump them up accordingly when you need it.
I'm grossing 10k# these days. Yes, technically overloaded according to the door sticker, but my H-rated (16ply) tires can take it.
Also, SRW trucks don't get routine checks around here so long as you're rolling down the road without a saggy butt.
What do you guys carry? I keep my weight down as much as possible. Longer van life and better fuel milage. I have my stock trimmed down to just service call stock and the basic stuff I use. On larger jobs I have crates for new work or commercial work and load them as needed.
I don't load and unload for particular jobs. Basically, everything comes with me all the time. I am completely mobile though with inverter and makeshift desk/workbench.
My best guesstimate is my rig weighs in around 8000# empty (i.e. empty shelves and toolbox).