After fueling up at Love’s, we weighed our coach and truck on a CAT scale there:

Here’s the report via their handy app:

These weights are within the acceptable ranges for this coach; the front axle rating is 16,000 lb, and the rear is 24,000 lb. This was weighing it fully loaded with our stuff, a full tank of diesel (150 gallons), 5% fresh water, and empty grey and black tanks.

I found this advice on the tire pressures:

Here’s the formulas:

Front axle weight/2 X 1.05 = Weight to look up in single wheel chart. Add 5 psi for your final inflation pressure.

Rear axle weight/2 x1.05 = Weight to look up in dual wheel chart. Add 5 psi for final pressure.

The 1.05 is used to estimate side to side weight differences that you will see when you do individual wheel weights.

And finally, do not inflate a tire less that 80% of the max side wall pressure.

So for us, our front axle weight (14,980 lb on 2021-10-29) / 2 (for each side) * 1.05 (to offset side-to-side differences) = 7,864.5 lb (for weight table).

Front tires are Michelin 315/80R22.5, rated max load 9,090 lb (for single) at max 130 psi cold, so table says 110 – 115 psi; should go with higher.

So front tires should be at least 115 psi for us. A bit higher (less than 130) is okay, but gives rougher ride.

Rear axle weight (23,220 lb on 2021-10-29) / 2 (for each side) * 1.05 (to offset side-to-side differences) = 12,190.5 lb (for weight table).

Rear tires are also Michelin 315/80R22.5, rated max load 8,270 lb (for dual) at max 130 psi cold, so table says 90 – 95 psi. But 80% of the max pressure of 130 psi is 104 psi, so that should be the minimum.

So rear tires should be at least 105 psi for us. Though when I posted about this in the iRV2 forums to check my math, there was some skepticism about the 80% rule. Still, 95 to 105 psi is within an acceptable range.

According to the tire pressure monitor, the coach tires are all currently around 115 psi, which is perfect for the front ones, and a little high for the rear, but still good:

Our site in the Valley of the Rogue campground had electricity and water hookups, but no sewer. So we had to be a little careful with water usage. Not as much as in the trailer in Yellowstone, as our coach has fairly large tanks (50 gallons black, 70 gallons grey, plus 90 gallons fresh water). The black tank is for our two toilets, and the grey tank is for our sinks, shower, dishwasher, and clothes washer.

We didn’t do any laundry during the week, as the washing machine uses the most water. We did run the dishwasher a couple of times, on the “eco” setting, as it doesn’t use all that much. And we went a couple of days between showers, and did them “navy” style, where we get wet, turn off the water, lather up, then rinse off.

As it happened, we didn’t need to be quite so careful, as we ended the week with only 67% of our grey tank used, and 79% of our black tank. But for the first time without a sewer hookup in this coach, we wanted to err on the cautious side:

To avoid hauling that waste water to our next campground, we stopped at the dump station on the way out: