I think the approach to this problem as stated by Mr. Anderson is all wrong, in retrospect.
His Tech-Link deal has a built-in feature which indicates when it is time to buy another coach. The light, when blinking means: Buy a slide coach, buy a slide coach, buy a slide coach.
It's an automatic feature which has no manual override and is a built-in MPD dosing function.
The good thing here is that when you get to 5 buses, you can get a fleet discount on insurance and tires.
Good stuff.