Ingersoll, Emglo, Rol-Air, Curtiss.....So many choices, hey?
How much is in your budget? I built a portable(sorta) 30 gal horizontal that works well , I do kinda the same thing with it that you are doing as well.
It has 7 1/2 hp Marathon motor turning a 10hp 2 stage Ingersoll pump. I put those on top of a horizontal 1/4 inch wall 30 gallon tank, mounted that in a cage, which has scaffold wheels welded on for castors.
Sorry no pic

It pulls 38 A (220V single phase) at startup, runs at 18A until shutoff at 160 psi.

Well worth the $, about 1500 bucks all told. Thousands of hours running time over the past 9 years since I built it for my old business. It would often run for 6 hrs a day constantly for weeks on end with nothing more than an oil change. It now lives in my shop and I never seem to need more air.
For long runs or or when using tools that require a lot of cfm, I use 1/2 inch gorilla hose, then sometimes 3/8 . I am always amused by folks running a big compressor and then wondering why the heck the tools they are using dont quite do what they should ( sandblaster) Why have a big compressor and a little hose?

It often gets overlooked.
BTW - Small and occasional are relative terms