Hi Karl,
This is how it's done:
http://marathoncoachsales.com/news/B...on_9_30_10.php
In other words, by the end of the third year the coach is 100% depreciated. If your business is in a 35% tax bracket and you bought a 1.8M coach, you get 630K back compliments the IRS. Then, at the end of three years, you put the coach on the market for 1.17M and you're three year ownership cost was zilch. Repeat as necessary.
This is why you see a lot of 3 year old coaches on the market.
Admittedly my explanation is somewhat of a simplification, but you get the gist.