I'm surprised no one has mentionned ARB off-road products. They have 4 compressors that deliver outstanding performance and reliability.
A permanently mounted compressor has the advantage of not taking up precious cargo area. But if under-hood space is at a premium, there is a kit that comes in a carry case with all the accessories you need. I have an off-road modified 2003 Nissan Xterra with ARB lockers and on-board air. A must for serious offroading.
For the Subaru, on extended trips to remote fishing and camping areas: two cheap compressors do the job. Use them both to accelerate inflating the four tires. If one fails, I have the 2nd one !
(I do not sell ARB products - I'm just a user and a fan !)