I had a viar 400 in my 4runner (full duty cycle), which was a good thing, because under a load, it took a while to air up 35's. That was with a tank and everything. Electrics work, but short of an Oasis, none of them will even remotely keep up with an engine driven compressor.
My buddy had a sanden on his jeep. He could air up his 37's and have one to two of my 35's aired up, while I was airing up the other tires.
Air tanks in an OBA system are only good for that initial blast of air, once the pressure drops, you are running off of the compressor. I will have a tank in my system.
I have ran all of the systems, from my ARB compressor, Viar, Tsunami's, CO2 and had friends with Yorks/Sandens. Like most things, everything has its pros/cons, I just think that engine driven compressors have the least amount of cons.
Jack
My buddy had a sanden on his jeep. He could air up his 37's and have one to two of my 35's aired up, while I was airing up the other tires.
Air tanks in an OBA system are only good for that initial blast of air, once the pressure drops, you are running off of the compressor. I will have a tank in my system.
I have ran all of the systems, from my ARB compressor, Viar, Tsunami's, CO2 and had friends with Yorks/Sandens. Like most things, everything has its pros/cons, I just think that engine driven compressors have the least amount of cons.

Jack