Hey there flydream. Nice build out. I have a 2018 F150 6.5 bed, Supercrew with the Eco Boost engine. I went with Bilstein B8-5100 @ 2" increase for the front because the 6112s had a lower spring rate than what was already on my truck. I did B8-5160s in the rear. I the like the set up. I had Boise Spring Works make a new custom leaf pack for me rated at 2000lbs. No sag, no air bags and the truck drives great with it. The leaf pack was around $500 (they reused a couple of the stock springs in the new pack, but it is not an add a leaf).
I'm running 315/7017 KO2s (34.4")on Method 705 bead grip wheels. I have the stock 3.55 gearing with a rear locker. The eco boost and 10 speed transmission handles the weight and increased tire size just fine. I'm sure 4.10 or 4.30 gearing would result in better mpg, but I don't want to spend the money. I'm getting mid to low 17s mpg on the truck calculator with mostly around town, forest roads and 65 mph two lane highways. We also have done some fairly technical trails, well as technical as a 160" wheel base truck with a 2" lift can do. I really like the ~35 inch tires and the Bilsteins. By the way, I get no rubbing with this setup. Here is a photo from a recent trip.
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