Any 1999 motorhome is going to have issues that will require addressing. It sounds to me like the dealer is making an over the top effort to address the known issues with this unit. I would ask him to replace the caliprers and have the brake system flushed. After that I would give you better than even odds you will find another issue to address. Brakes keep you off the road. Accessory failures (as in crusie control) usually do not. If the price is as good as you indicate, and given all the issues the dealer has already addressed, I would think hard about walking away for another motorhome with unknown "issues".
