I'm now a guy with a compressor
i keep mine under pressure all the time, i just turn it off when I leave the garage and shut the main valve so it doesn't drain off. Holds pressure for weeks, every so often drain it to get the water out of the bottom and your all set.
I would consider a drain valve extension on the bottom. I did that and I'm glad I did, i do not have to roll around on the floor to drain it just kneel beside if and hit the valve