I had a great 12v compact '180 PSi' inflator back in the mid 90's. I'd air down 4 30x10.5x15s to the high teens for soft sand driving, then back upto 30 something for back on the pavement. It quit in the early 2000's.
From then till about 2007 I went through several 12v models. They all became loud slow deflators when they overheated and the piston cup burnt inflating smaller volume tires from mid 20s to mid 30 PSi ranges.
In 2007 I got a Tsunami/masterflow mv-50/ 1050f.
Horrible QC, but simple, reliable, and easily improved, and still working well.
I went a bit nuts. The plastic air filter had a bunch of mold flashing blocking the air intake. Huge improvement after flashing removal.
I hated the screw on valve fitting. I retapped it for standard 1/4"NPT fittings, Modified with a better coiled airhose and locking tire chuck, drilled to passive.
The relay in tailcap was cheap and poorly soldered awith hideous crimpnuts wire joinery which easily pulled apart. No stress relief on the 14awg wires entering endcap.
New quality relay soldered with 10AWG to 45 amp anderson powerpole connector, new cordgrip, and added a insanely powerful 80mmx36mm 8500 rpm Nidec server fan blowing over the finned head.
The heatsinking of cylinder to finned heatsink head was laughable at best. Not much to do but add some thermal grease between, and add concentrated airflow over the head.
The thing works great still. Pulls 16 to 20 amps depending on battery voltage and tire pressure, and with the fan no worries about common duty cycle instructions, 5 minutes on 30 minutes off, overheating CYA BS.
I had to move cross country, and abandoned a porter cable 120vac pancake compressor. I hated it though. The regulator was worthless. When airing up tires it was so much faster and easier and quieter, to pull out my modified 12vDC MV-50 instead.
I need a new compact 120vac compressor now, or a way to hook my MV-50 to a small compact tank to run a pin nailer around 100PSI.
Recently, as My 18v makita drill/1/4" impact drivers batteries were toasted, I decided on Ridgid 18v battery tools. I've now got 2 2.0AH batteries, and 2 4.0Ah, batteries, but their inflator is not on my wishlist.
I had a friend order a Viair. Smaller than I expected, forget which model. I was disappointed to find it drew 18 amps, but no relay, and a switch rated for only 15 amps AC.
Worked as well as my larger MV-50 though.
It got sheathed marine 10-2 AWG, and a 60MMx 38mm Delta high RPM/CFM added to blow over head, but no room inside tailcap for a relay.