Motorhome weighed - Tire Pressure to set

kmb1966 wrote:
Could someone double check me on my air pressure? I could not find a weigh station to weigh all 4 corners, but I do have front and rear weights so far. Loaded the RV for travel.
Front: 6,540 lbs
Rear: 12,200 lbs
Total: 18,740 lbs

Tires are 245/70 19.5 14 Ply.
Hercules tire says maximum pressure 110 lbs. But they only show inflation table for 110 psi. Shows same carrying weights on the Single and Dual as the Goodyear G670 table.

I am putting 95 lbs on all 6 tires.

Don't worry about weighing all four corners, use any inflation chart for the same load range tire and then add 10 - 15psi to take care of all the variables you will encounter, from shifting weight to changes in ambient temp. and everything else, in between.

Filled in your weights in my made extra save pressure-calculator.
Gave for the maximum speed of tires , wich is most likely 75m/h, next advice.
Front 86 psi Rear 85 psi.
but also derated the tires for as if 99m/h was maximum speed, together with the 10% reserve adding for R/L inbalance, it gave next advice. Front 97 psi and Rear 95 psi.

This is the pressure I advice for maximum reserve with still acceptable comfort and gripp.

Did you have everything in the Motorhome when weighed, so also all the persons. Otherwise we would have to add some weight to the axles and calculate a new advice.

80 psi would be the safe bet and still have a soft ride, you can do the fronts at 75 psi but would not go below 80 in the back, if you tow a trailer with some hitch weight than 85 psi or more in back would be better.

I don't know why people say you need to weight 4 corners, just load RV even on all sides and just weight the front and back axels, that is all that is needed..

I call BS on weighting 4 corners, not needed unless your motorhome is leaning for some reason..

I just weighed my Super C today to do this. I used the Uniroyal chart for Load range G, all of mine are G's. 6200 steer, 75-80 PSI. 12600 drive, 85-90 on the duals.

Yes, but I'd still run 70, maybe 75 because on not weighing corners.

Ivylog wrote:
You are almost 400lbs/tire under the weight for 70psi, the least amount of pressure on the chart...I'd run 70 all around.

You sure you're not looking at the chart line for tires pre 2006?

You are almost 400lbs/tire under the weight for 70psi, the least amount of pressure on the chart...I'd run 70 all around and not blink an eye.

Based on your weights, and if it were my RV, I would sleep very well at 85 psi all around, and not blink and eye at 80 using the Goodyear tire pressures.

I think that doing the same pressure for 51% of the weight may not be the best ride, nor the best handling.