This is the door sticker, and the tire size on my truck. The tire state max of 51psi. and it came from the dealer with 43psi.
What is best for everyday driving? Should I increase it for towing 3500lb. camper?

 

I can't speak to what your towing psi should be. But vehicles are notoriously over inflated coming from dealers. Ford recommends 35psi for everyday driving. I would find what gives you a comfortable ride around 35 psi.

 

There is a big thread about tires and pressure, may have been in the 2015-2020 forum, but would apply here still. I believe the manual recommends 35 PSI regardless, but many on here said they increase to 40 or so to stiffen the sidewall which helps a bit with stability, especially when it comes to TTs. Some said they increase their cold pressure to 37 as they say it provides for better handling and that Ford recommends 35 because it softens the ride and makes owners "happier" that their truck rides softer/more SUV like.

Obviously those are all assumptions made by other owners, not Ford's stated position, but I can see where they are coming from on most of it. My recommendation is to not ride near max, try different pressures at maybe 2 PSI increments and find where you like the truck to ride. When towing I suspect there is an advantage to going up 5 PSI or so.

 

My truck came with over 40 psi in the tires. One of the first things I did was lower to 35. Rides nice. The only thing I tow is a small trailer with a UTV, probably tops out at about 2500 lbs total. I haven’t seen the need to increase my tire pressure.
your trailer ball weight should be around 350#, 40 lbs would not hurt.

 

Thanks guys. That is what I was thinking. Just looking for confirmation. I had always been told go with door sticker.

 

Every tire is a little different depending on the ply tire-- for example a 10 ply you can inflate to 80 PSI however they were better on a 1/2 ton truck at about 40 psi. LT tires will run a higher PSI as oppose to passenger tires. The best thing to do is try different PSI and run the tire and check to see how its wearing-- if it is under inflated it will wear on the edges--over inflated more in the middle. Old school we used to run a chalk line across the tire and run it down the road and see where it is worn off.

 

I run 35 psi front and 33 psi rear on my 2015 Lariat Screw FX4 Sport with 33" P-Metric tires on 17" OEM rims. I air up to 40 psi all the way around when towing, and to 50 psi if approaching maximum tow loads. I find the 33psi rear helps keep the light rear suspension from skipping around on washboard roads.

 

In my 18" tires I find they are about perfect at 38. 38-40 up front and a bit less in the rear is really nice.
I found 32-35 are a bit too sloppy for the Primacy tire. If you have a more rigid tire, adjust accordingly but the soft HT (highway) tires can handle around 40 pretty nicely.

Yes, you should air up the rears more when hauling a heavy trailer (heavy tongue weight).
Don't forget the softer the tire (less air) the more it will heat up and risk a blow out. Meaning a soft tire during a tow is at greater risk. Not to make it sound scary, just to be aware it may require a few more PSI to support the weight and run cooler.

Note: The maximum pressure listed on any tire isn't meant to be the daily driver inflation level. You should be at 51 max if you're in an extreme scenario.

 

I've always gone with the door sticker & (being a retired tire factory worker) am religious about maintaining tire pressures during temperature changes - I always seem to get as much or more mileage than the tires are rated for.

Learned a lot about temps / tire pressure changes since 2004 when I bought my Jeep Overland - it has the 4 corner pressure readout on the overhead display, so you can monitor the effect temperatures have on tire pressures (if you're into that sort of thing)!

Everything I read says nitrogen in tires is useless, but one of the "perks" that's supposed to come with my new truck is nitrogen in the tires.
I told the dealer not to worry about it as I'm going to change the Pirelli Scorpions for GT Wranglers.

Since they "owe me one", I'll probably have them put the nitrogen in the Wranglers just to see how much less pressure variation it has during temperature swings.

I might be willing to put up with the hassle of nitrogen in tires if it means not having to adjust tire pressure each summer / winter.

Since the F150 has the 4 corner readout like my Jeep does, I can monitor pressure vs. temp on the fly.

 

My psi is 35 in the morning, but after driving for a while or in the aftyernoon the tire pressue reading will be 40-41 psi and back to 35 the next morning.