tire PSI with truck camper in bed

So the last month or so I've been hauling around a truck camper in my tacoma and just now thought about tire pressure in it (newb move I know). I have bilstein 5100's, firestone airbags, and KMC wheels with Duratracs

The camper weight is about 950 lbs dry. I always ran around 30psi with nothing on the truck, and have been going with about 33-35 psi with the camper on. Would anyone suggest adding more? Searched around a bit but didn't get a great answer.

Thanks

 

Do a web search for tire chalk test. There's some videos on you tube and other sites. There's too many variables re weight and suspension to give you an answer. Do the chalk test fully loaded with full gas tank or try to simulate the weight. If you leave the camper on the truck full-time you could also do another test with no additional weight so you know the tire pressure to use for daily driving.

 

You did not say what the stated max PSI is on your tires. Not sure what Toyota suggested on the door plaque of your truck regarding PSI but on my '01 they wanted 26PSI all around. I never subscribed to that as I personally felt 26PSI was too low because Toyota suggested that number as a balance between the original OEM tires and better ride quality. So I usually strike a middle number between 26PSI and whatever the MAX PSI number stated on whatever tire I have on the truck.
So say your tire says MAX 35PSI-with your extra 900lbs. I'd put 32PSI. If your tire's MAX PSI is more, maybe put 35-37PSI. My point is to handle extra weight while staying comfortably below the tire's MAX PSI.

 

Hopefully those are E rated tires. All that added weight, having E rated tires is just good to have.

But yeah, chalk test is a great way to check for even tire wear.

 

Well the max load is 2400 lbs and max 50 psi. So I’m gonna try 45 and see how that feels.

 

45 is likely way too much. Do the chalk test as suggested.

Start at 38. If tire is centered, drop 2lb at a time. If tire is edged, add 2lb at a time till its right.

 

I run between 45 and 60 PSI

Most times I have 1000 plus pounds

I just get what my tire person suggests third generation same family

I am told load range has replaced ply`s I think they are F load range.

 

I'm going to go against the grain and say the chalk test isn't that informative on radial tires. They're a lot stiffer than the bias plys that test was originally invented for and don't balloon out nearly as much.

On the other hand, I love math. Hold on tight.

If they're wearing nicely with a 4000lb truck with 30 psi in the tires, that means you've got (roughly) 1000 pounds per tire. Divide 1000 pounds by 30 psi and you've got a contact patch of 33.33 sq inches for each tire.

SO - if you want to add another 1000 lbs to the truck, and maintain the same size contact patch, we can do 5000 lb drivided by 4 tires divided by 33.33 sq inches and get 37.5 psi.

I'd run 37ish.