So, I think I'm the only one on there that doesn't have on-board air. I know what I'm asking the wife for Christmas.
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Maybe I'll stir the pot a little......
I don't have OBA and it's not on my wish list. I agree its pretty cool to plug into your bumper and air up FAST, but at what cost? I'm not just talking about the hardware cost, what with tank, plumbing and all, not to mention labor, which if you can't DIY can all add up fast. The main reason I am not doing this is because I lose my spare.
I believe that the number one tire failure type, or at least a leading cause, is sidewall damage. Not something you can just plug with a repair kit. In fact this happened to my son just the other day. I know there are hard core methods of stitching your sidewall together, but that doesn't seem practical for the average off-roader, to me. Point is I see my spare as a critical requirement.
Maybe you have a spare on a tire swing. So do I (brand new, will post pics soon). I still want a spare underneath. If I use my one spare "on the job", that leaves me one more to get to safety. When I think of doing weeks at a time in the middle of nowhere (admittedly, still more fantasy than reality, but we'll get there), I'm all about safety. I see OBA as a nice to have, not a have to have.
Lastly is the performance advantage of OBA. My new ARB compressor airs up my 33" from 20psi to 40psi at the rate of about 1psi/5sec. 20lbs, 100sec, I can live with that. If I need to go faster than that then maybe I need to slow down
I don't have any comment about the air tool advantage. It's not something I'm planning on enabling, so it's not been a factor in my thinking.
In summary, two full size spares, and a high quality compressor that can do the business just as fast as I need, that's the solution for me. My 2 cents.