AIR PRESSURE IN CLASS A TIRES

Windsor-Monaco wrote:
Is this strong enough to fill 295/75/r22.5 tires on our 40 foot Class 'A'?

To answer yours and the OPs question, the optimum word in your question is: "Fill". To FILL a 22.5" tire from 0 to operating pressure would seriously tax a small air compressor that many of us carry. But, to "Top off" a tire of that size is not too hard on them but, they still have to work at it a bit.

While many diesel pushers have air outlets, hoses and air chucks supplied from the factory, as stated, many of us carry auxiliary small air compressors for various purposes. And the gas coach operators use them too. Ours is the popular Sears unit that pumps to 150 and is about the size of two brief cases glued together. I've purposely lowered the pressure in one of my 255/22.5 tires to 95 psi so I could see how fast it would refill it to travel pressure of 100.

Now, I can't remember because this little test was over a year ago but, I'm pretty sure that that little compressor topped off that tire to 100 psi in about one minute, maybe less, I'd have to try it again to reaffirm my statement here.

But, the point is, there are a few small, (not too small) compressors on the market that will help keep them up to par. I don't have the tool/part number for ours but, it's carried by many here on the RV.net site.
Scott