Motor home tire pressure

Lurker52 wrote:
Hello Everyone,

I have a 2001 Monaco Night 36’ DP. My question is about tire pressure. The tires are Goodyear G 661 HAS load range H 255/70 R 22.5 The tires say max. pressure 120#

I am not sure what the correct pressure should be. I have not weighed the RV but I have a Cat Scale ticket from the previous owner. He weighted it ready to travel. Full fuel gear and water.
The ticket shows a total of 27,140# but 3120# of that is his toad. The front weight was 8640#. The rear was 15,380#. If I understand this right that means each front tire has 4320# on each. The rears (duallys) have 3845# on each of the four tires.

The sticker in the coach says to inflate front and rears to 80#. I have looked for an inflation chart on the internet for these tires and have not found an exact match. I have found very similar Goodyears that say the rears should be at 80# and the front at 85#.

When I checked the tires, they are at 90#. I would like to lower the pressure a little to help with handling. The RV has the steering box that is not adjustable and has some play in the wheel and wonders a bit at high way speed 60-65 mph.

Any insight on correct pressure or where I can find a chart is appreciated.

Thanks as always,
Lurker

Have put weigts of former user in my made extra safe calculator.
Gave Front 103 psi so make it 105, and rear 99psi so make it 100.

Ofcource new weighing, as suggested, is better, wich you then can use for years, the little variation will be covered by the reserves I put in.

Calculator spreadsheet first adds 10% to weighed axleloads, and then calculates with a safer formula then those are used for the official lists, so higher pressure outcome.