I also carry an AC compressor with a 2-gallon tanks. I bought it for about $60 on sale at Walmart. We also run the trailer tires at max psi since we discovered low pressure builds heat and eats tires. A blowout or two cures you of running tires soft on the trailer.
But before you air up those tires, check the max psi on the sidewall. Load range E will be 80 psi but some of the Montanas, like ours, came with load range D, max 65 psi. The D is rated to carry the weight so that's not a problem but airing our tires to 80 psi just might be a problem.
We have found a few stations where we could get in but it can be awkward. With the compressor onboard I'll not need a station unless we have an air loss on the road and then I'm probably going to change the tire instead.
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