In a few months I'll be investing in a backup to be there just in case my Box truck breaks down. I'm considering putting a portable in my trailer. So, for a backup unit, what portable would you get? Keep in mind, I have no knowledge of portables. I've read conversations talking about different vacuum motors, and I am elementary to all that. I'd like to get another truck mount to put back in the trailer, but that's not in my budget for a couple more years. Heck, in a couple years I hope to have the need for another van/tm setup. But, in the meantime, I need a portable backup. So what's your thoughts?