dstefan
Well-known member
Pretty content with the build out, and getting plenty of use this spring and summer. Thanks to all for the postings, I'll add some pics in case helpful to those still planning.
Few questions for those more knowledgable:
1) suspension upgrade
Currently stock F150, . Fully loaded I'm right at GVWR, ~7000lbs. Planning on Bilstein 6112 @2" in front and 5160 in back. seem reasonable?
I expect I might be squatting after the 2" lift when loaded, not seeing much regarding add a leaf options for my particular truck, should I be looking at custom leaf or RAS system, reviews on airbags seem mixed.
2) tires - stock 32" tires (275/65/18)
I'd like a bigger tire than stock, I've tried to keep everything as light as possible, should I have the same mindset for tires? I like Falcon wildpeaks but the 285/70/18 (~34") are 69lbs and C rated, not much else I'm keen on in this size range. I could instead get plenty of AT options with 275/70/18 (33"), generally all E rated, mid 50lbs, or make a really big jump to 285/85/18 (35") but that might require some vehicle trimming and I'm worried might tank my gas mileage. Lots of all season highway miles, forest service roads to very rough road hunting and fishing mobile is my goal. Is the ~15lb/tire weight penalty of the Wildpeaks for a C rated tire not worth it and just stick to 33" upgrade now.
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So, my opinion based on ZERO F150 experience, but having built two offroad vehicles for both light overland as well as more involved and difficult trails is that the tires and springs are exactly the two most critical and first things to be addressed. How far you go with both depends a bit on use case as well as weight
Tires: Yep, bigger and heavier extract a cost in mpgs and somewhat bigger and heavier are worth it for tougher stuff, but IMO unless you want to do really serious rock crawling you don’t need huge tires. My previous rig, a Tacoma with hard tonneau and heavily loaded, but no camper, could go stupid places with 32s and I used to go out with my friend in a Jeep on 35s with no problem, but occasionally took an easier line. Those were C rated Duratracs which I loved, except for the road noise.
For my Tundra/Ovlnd build I also wanted to stay as light as possible. Went with Cooper AT3 XLTs 34s (285/75/17s — 33.8”, LL E ) based on Cooper AT3 experience on my wife’s 4Runner. They are as good as the DuraTracs offroad and better on-road for mpg and comfort. Also lighter by a bit over other good ATs of the same size. Subsequently I’ve seen quite a few people on EP and Wander the West tending to run these on heaver camper rigs. Thought about 35’s , but the extra weight and low speed suck on torque for maybe a 1/4 to 1/2” clearance over my 34s wasn’t worth it. I have had no clearance issue on the 34’s on ledges and big rocks throughout AZ and UT. Been running them for 3.5 years and lot’s rocks and dirt. They wear well on road and off, though there’s a bit of minor chunking. Great grip and actually very good aired down to 20 psi in deep sand. Only flat I’ve had was due to picking up a screw, which isn’t the tires fault.
The other issue is that on my Tundra at least, the larger tires combined with the camper weight and wind resistance (along with the need/desire for F/R lockers) led me to regear to 4.88s which has been great. The Tundra has stock 4.30s and a low first gear, but the 4.88s make a big difference on the highway performance and mileage. DK the year of your F150, but if you have the 10speed tranny and a turbo that may not be an issue. Also try a tire size calculator with input for gear ratios — very helpful in decision making. This one is excellent: http://www.grimmjeeper.com/gears.html
Springs:
Rear spring upgrades (along with shock upgrades) made a huge difference in both on and offroad handling, especially with the camper weight. Went with Deaver’s on both and the Tundra springs were spec’d for a constant 1000 lbs in the bed and a 2.5" lift with 3/4" shackle (ended up 3.5” unloaded and about 3” loaded). Due to supply chain issues I had to run the rig briefly without the springs and what a difference when I got them. I’m a little oversprung for the weight I carry, but that is no problem and leads to tighter road handling and better off-road performance and departure angle (which has been really helpful on tougher trails). Couldn’t be happier with the setup.
Best advice IMO is avoid the add a leafs, etc and just go for a set of Deavers or Alcans spec’d to your needs and weight. With the camper I think this is the upgrade you may feel the most, unless you have to regear.
Hope that helps!