I carry this compressor (it was $90 less when I bought it 18 months ago).
I use it to winterize my coach and have not had any issues. It only takes me 10 minutes and there is no mess.
You do want to make sure you use an oiless and tankless compressor like the one I ise so you do not potentially contaminate your fresh water system.
I set the regulator at 50psi and then open all the faucets, etc. until water stops spitting.
You stilk want to pour some antifreeze down the drains.