Maxiis tire pressure

Air them up to the max of 65 psi. This is the safest thing to do for the tires themselves - You WILL NOT over inflate them at that rate.
Been running Maxxiss at max pressure for several year now on my 7200# TT and they wear perfectly.

If you have severally over tired the trailer (50 % +) then max sidewall pressures may be too much but if your tires have say a 15-25 percent reserve then I would use max pressure for max long term performance.
These folks pass along some very good info on the subject

rvsafety.com

Tire Load and Inflation Ratings

Note: Towable – Travel Trailer/ 5th Wheel owners Due to the severe use conditions experienced by tires when axles are very close together – tire industry experts recommend maximum (sidewall) inflation pressure for towable tires unless this causes a sever over-inflation situation (20psi+), often referred to as the ‘basketball effect’. If this is your situation allow a 10 – 15psi safety margin above the minimum required inflation pressure.

and Tireman9 one of our member/tire engineers also recommends max sidewall pressures says; from rvtiresafety.com his online tire blog;

"The manufacturers do not take into consideration the side to side unbalance, as to do so would require them to provide larger (more expensive) tires. The other thing RV industry does not take into consideration is the forces to the tire structure due to running close axle spacing. Engineering analysis shows that when turning corners the forces trying to tear the tire apart can be over 20% higher in multi-axle applications than with tires at the corners of the vehicle.
The only options for the trailer owner are to up-size the tires (if there is room) or up-rate and increase inflation (if a higher Load Range tire and stronger wheels are available). Lacking the above being sure to run the tire at the inflation shown on the sidewall (i.e. max) will slightly decrease but not eliminate the overload forces.

azdryheat wrote:
But if you over inflate the tires they will wear prematurely in the middle and wear out sooner.

I've yet to wear out a trailer tire. I've had them fail and I've had them age out, but never wear out.

Rusty

downtheroad wrote:
Here is the inflation chart:

Maxxis 8008/ Inflation.

That chart doesn't make sense. My loaded weight on the tires is 7200lbs. 7200 div 4 equals 1825lbs on each tire. Using 225/75/15 D rated tires the chart recommends 40psi. ?

I could see running 55-60psi. But 40psi is really low. Max load per tire is 2540 @65. FWIW I have close to 10,000 miles on the tires running 65psi and they still look great.

65 cold in the morning before the sun hits them and before they roll.

But if you over inflate the tires they will wear prematurely in the middle and wear out sooner. I took my trailer to the scales and found out how much weight is riding only on the tires and use that to figure the PSI (13,025 in my case). I can then figure the weight and PSI when I put toys in the garage and adjust the tire pressure accordingly.

ipeltier wrote:
I have Maxiis radial M8008 load range D tires on our fifth wheel. The Rv loaded weighs around 8500 lb. Does anyone know what the psi should be?

You should inflate them to the max pressure. You don't know the individual wheel loads. RV's are never perfectly balanced, both static and dynamic conditions.
MM49

Here is the inflation chart:

Maxxis 8008/ Inflation.

65 PSI will give you 10,160 lbs of capacity and serve you well.

I would just pump them up to their maximum of 65psi. I replaced my LRD Blow Max tires with Maxxis LRE and run them at 70-75, but not the max of 80 since my fiver isn't that heavy.