I did OBA on my M715 back in 2005. I installed M35 air tanks under the bed, ran hose to both bumpers with quick connects, made a York compressor fit and did the oil passage block on the York.

I loaded up air hose and air tools in the tool box and when I had a flat on a trailer, I got them out, fired up the compressor and used the impact to change the tire. I thought it was the best thing ever.

At the 2006 National FE in Tennessee, I aired down my XZL tires to 12 psi or so. I wanted them back up around 50 for the 800 mile drive home. I had trailer issues on the way to the event and wanted the truck ready to drive itself if something happened on the way home.

It takes a lot of air to fill up a XZL. I was about half way done with the 4th tire when the compressor killed itself. DP had OBA on his CJ and that finished off the job.

I found another York, did the oil passage thing again and put it on the truck. While recovering my Gasser M35's it was used for hours on end. So much that the semi air brake hose melted. I then ran copper from the compressor to the tank.

At the 2008 FE in Colorado, I had tire issues. My clutch on the York started shorting out. I went through a dozen fuses that week. I fixed it once home.

Now that I have the 6.2 and 2 alternators. I removed the OBA. I am going to go with a Powertank instead. More psi, portable and multi vehicle. Less money in the long run too.

Just my lessons and suggestions.