Trailer Tire Pressure for My Tin Boat

[MarPar]

Gents!

I know trailer tire pressure is of utmost importance, but I would like to see where the ends of the safe spectrum are. I purchased these wheels and tires new a couple of years ago...

https://www.etrailer.com/Trailer-Tires-and-Wheels/Kenda/AM31985.html

I have used them a few times and found out that my boat and trailer are a bit too light for them as when they hit bumps and potholes etc at the max 70psi, the trailer hits HARD. Rattles everything and the trailer even hops a little to the side.

The last time I took the boat out I went to my buddy's lake 30 miles one way and lowered the PSI down to 55. Rode MUCH better and soaked up the bumps very well. I'm pretty sure 55 is too low and I risk a blowout, so I started poking around the interwebs for background.

Etrailer experts says 65PSI is recommended for this tire with a D load range...

https://www.etrailer.com/question-2...znLJfsEdBWYtFW7_tc_DQwfJx8adGFXxIKniGVfg0ZLPo

I've read that you should have them inflated to the max PSI that reads on the sidewall as that is how they were designed to run.

So basically Im all over the place and my question is, can I run them at 60 or 65 PSI for an extended period (leaving for a 3.5 hour trip to Wisconsin on Friday) and not risk a blowout? I don't want to be that poor sap on the side of the highway changing out a tire. Although I always do bring the bag of tools with the impact in it and a floor jack to make a speedy change just in case.

Pics of said boat and trailer

 

[33 IMP]

I normally would have echoed the advice to run the max pressure that the tire says.
However, in your case, with stout tires and a light boat..... I'd set em to 55 cold, take a tire gauge along, stop for breakfast/lunch after 50 miles, measure tire pressure, and feel how hot they are.
Cool tire, at 60 lbs? I'd fly em as is. Are they warm? I'd put 75 in.

 

[Triplegreen500]

Why the hell do you have D's on a trailer that lightweight?

Get tires rated for the GVWR of the trailer. You should be running C's, tops, on that rig - and 35-50psi. Too low, it'll pogo; too high, and it slams in the bumps.

https://www.etrailer.com/dept-pg-Tr...ntent=Trailer Tires and Wheels - Load Range C

As light as that thing looks, you may want B's. Do your research.

Discount Tire | Tires and Wheels for Sale | Online & In-Person

 

[RemCharger]

Holy crap it's not a 1 ton, you could probably pick the back end up if you were pissed off lol. 35 -40 lb tops