A couple quick things; in order to make the wheels/tires extend beyond the fender you will need more negative offset. Too much negative offset can cause addition rubbing.
Also, you mentioned this was a work truck? Will you be towing? If so, I would suggest limiting your tire height as well as weight. The taller and heavier your tires get, the worse your towing performance will be. I have a 3.5” lift and ran a 305/65/17 (32.8” tall tire) Cooper STT Pro for a while with a wheel that has 4.5” of backspacing (AKA -12 offset). The truck could still tow my camper on a hot day, but the tranny and engine temps would climb very quickly if I wasn’t careful. Fuel mileage suffered too, even more so while towing.
I recently switched to a 285/70/17 BF Goodrich KO2 as a winter tire. These tires are the same height, 12 pounds lighter per tire, have considerably less road noise, good traction in weather and I noticed an improvement in fuel economy and torque.
Here are a few different pics of the stance and clearance on my rig with the two different types of tires. The bronze wheels have Ko2 and the black have the mud tires
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