Our motorhome is a 2016 Newmar Dutch Star, a large vehicle to say the least. Its 41′ long, stands over 12 1/2′ tall and weighs in at ~39,000 lbs. All this weight is supported by 3 axles and 8 Michelin tires. Tire performance on these big rigs is important so each motorhome manufacturer works with tire makers to spec tires that will safely carry their design loads.
3 Axle Configuration
On our coach, Newmar installs Michelin 305/70 R22.5 tires that are capable of carrying a wide range of weights depending on how much air is in them and ranges from 75-110 psi. Looking at the above photo of our coach, you can see 3 axles. The front “steering” axle has 2 tires and support 14,000 lbs, while the rear 2 axles utilize 6 tires to support 25,000 lbs.
The front tires require 110 psi and the rear 80 psi. There’s really no way for most coach owners to change a flat (but some do) because they are so large, heavy and require really powerful impact wrenches to get those lug nuts off and back on. Plus who wants to give up that much storage space?
Tire Pressure Monitoring System
I keep track of our tires pressure and temperature while underway using this electronic monitor. I installed valve stem sensors on each tire and they monitor and report back to this little device located in the cockpit.
Tire Maintenance Tools
I also check tire temperatures at each stop using a laser temperature gauge (that little black and yellow gun looking device) just to make sure I don’t have a tire overheating or a brake dragging.
Keeping on top of all this is a lot of pressure, but it’s worth it.