Load Range E tire pressure: how do you keep them up?

I've got one of those pancake compressors from hazard fraught that I bought for my air powered brad nailer, and I've used it to air up the 80 psi LRE tires. It worked fine. For the money those are ok comprsessors, although the optional extended warranty is a good idea.... you'll probably need it. I did....the first one died in a few months.