Running load range C and D on toy hauler

1sandiegan wrote:
I also tried finding the max PSI of the wheels, which are Carlisle wheels. The website states:

What is the maximum psi limitation for your trailer wheels?
Max air capacities are typically a function of the tire, not the wheel. Unlike tires, the load rating of a wheel is not generally dependent on the operating pressure. The wheels themselves are manufactured and tested to a load rating (without consideration of pressure) and can safely support that load. As long as the load is within the limits of our wheel's load rating in pounds, our product will perform as expected.

Carlisle makes 15" trailer wheels with a;
...1870 lb capacity
...2150 lb capacity
...2540 lb capacity
...2830 lb capacity

Same with a 15" load d tire at 2540 lb capacity. You will have to use a 15" wheel with a 2540 lb capacity rating if you want the benefit of the higher load D tire.

Carlisle has a 15" 6 lug wheel rated at 2830 lbs. If your trailer has 6 lug hubs and a 2830 lb rated wheel your good to go with a load E tire at 80 psi.

However with a 16' trailer and a 7000 GVWR the OEM 225/75-15 load C tire has 8600 lbs of capacity for a whoppin' 25 percent reserve capacity.
Trailers unlike a truck/van/suv can have too much tire. ST tires need to be ran at max pressures...and if your using Carlisle its part of their new tire warranty. There is no benefit of a load D or E on that size trailer.

The biggest downside of mixing different load ranges on a trailer is braking....especially on wet pavement. Just take it easy on rain slick roads.
Different pressures (50 psi vs 65 psi) and different tread patterns and different tire diameters and different tread widths/etc can change a tire contact patch or traction. Just be aware especially during hard braking events.