Something I meant to post earlier that is inexpensive but can yield big savings.
These can be purchased for a dollar or two just depending on where you shop.
It can help you to save big depending on how much you drive by keeping your tire pressure where it should be. Low pressure in tires can eat gas mileage and prematurely wear out your tires. Big expenses.
Some of these have readings from 0 to 50 psi while others will read higher like 0 to 100 psi. You can Google for the recommended tire pressure for your equipment.
There are different styles of these and some have dial gauges where other more expensive types are digital. The time to check and adjust your tires is earlier in the morning when it is cool before you drive. And check them twice a week if you are on the road a lot. Once a week otherwise. If you don't have the means to put air in your tires in camp, add a little extra air the next time you air up at a service center. Then the next morning early check the tire pressures. If they are a bit over you can let some of the air out to get the reading your rig is supposed to have. Some people will run a pound or two of extra air pressure which will give a little better gas mileage and longer tire wear. But expect a little rougher ride if you do that.
Being aware of your tire pressure when on the road should be a primary concern for economy and safety.