John makes a very good point here. It really is not about versions and models but about dollar values. To trade in say a pair of M60s for 2pr of QS8s falls into the upgrade category in terms of dollars. We really just need the original new selling price of the trade-ins to be less than the current selling price of the upgrades by some margin to make all the numbers work. I will work out what that margin needs to be and make this modification to the pilot program.
President & Chief Engineer