i have a ~35 foot TT with spread axles. I recently had the TT weighed and each tire has about 2,000 lbs on it. The current tires are ST225/75R15 D load rating. I've purchased 2 Maxxis ST225/75R15 E tires. They will go one one axle (Rear - only because that's where the spare is now). The bad tire is gone an the other tire will be kept as an off the rim spare.I was originally going to run the E tires at 80 PSI and the D at 65 PSI. Will different tire pressures change the balance between the axles or will the equalizers on the suspension take care of that automatically?

Its been my experience when I had several trailers on the road that one axle with a different pressures (65-80) or tread pattern or tire diameters than the other axle(s) can have different braking characteristics especially on wet roads. The trailer will be fine but Just be aware. Balance between the axles ?? Different tire pressures will have little to do with how the equalizer bar does its job of equalizing the load unless there is a large difference in tire diameters. Also due to braking rotational forces the rear axle brakes tend to lift the front axle a bit through the equalizer bar on hard braking events. If I had tires different in diameter I ran the larger diameter tires on the front axle. Doing so helps eliminate flat spotting.

I don't have any techical knowledge to share, but I would go ahead and buy two more Maxxis tires and not have to be concerned about any potential problems from running different tires on each axle. On the other hand, you could take it down the road on a trip and see if you have any problems.

You can run the E-rated tires at 65PSI no problem. They are only carrying a D-rated load, and only need to be inflated to D-rated pressure to carry it.In fact at 80PSI you will probably see abnormal wear in the middle of the tread.

mkirsch wrote:You can run the E-rated tires at 65PSI no problem. They are only carrying a D-rated load, and only need to be inflated to D-rated pressure to carry it.In fact at 80PSI you will probably see abnormal wear in the middle of the tread.Exactly!!!!!!!!!!!!

Thanks.People need to understand that the maximum inflation pressures are not law. There are no "tire pressure police" lurking in the bushes waiting for you to only put 79psi in those load range E tires, so they can drag you and your family off to a gulag in Siberia.

Mixing Load Range D and E on TT | Good Sam Community

scbwr
Explorer II
Aug 04, 2016
I don't have any techical knowledge to share, but I would go ahead and buy two more Maxxis tires and not have to be concerned about any potential problems from running different tires on each axle. On the other hand, you could take it down the road on a trip and see if you have any problems.
JIMNLIN
Explorer III
Aug 04, 2016
Its been my experience when I had several trailers on the road that one axle with a different pressures (65-80) or tread pattern or tire diameters than the other axle(s) can have different braking characteristics especially on wet roads. The trailer will be fine but Just be aware.

Balance between the axles ?? Different tire pressures will have little to do with how the equalizer bar does its job of equalizing the load unless there is a large difference in tire diameters.

Also due to braking rotational forces the rear axle brakes tend to lift the front axle a bit through the equalizer bar on hard braking events. If I had tires different in diameter I ran the larger diameter tires on the front axle. Doing so helps eliminate flat spotting.

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Mixing Load Range D and E on TT

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