Depends on how much you want to spend. The Eibach 2/2R kit is pretty good. They say the Eibach Stage 3 is also really good but it’s back ordered literally every where with really an unknown timeframe. There are several other options you’ll find in the suspension section of this forum as well. If you aren’t looking to spend much, I’ve got a listing in the classifieds of the original setup I used on my 21 to run a 34x12. Not positive if it would work for a 35x12.50.
These came off of my 21 Tremor when I switched to the Eibach 2R when it was released. Eibach Lift Springs Eibach Pro Truck Front Shocks Rough Country Vertex Rear Shocks $300+shipping (I have no clue how much to ship, but I’m hoping it’s under $100).
www.f150tremor.com