Mark you'd be better off building your own APU I have designed one similar to the pony pack for around $1000 I have one more piece to research. Electric fan VS stock clutch fan. An electric fan would eliminate the need for a seoarate condensor/fan for the APU. Granted it uses a cheap chinese diesel for now but I plan to take the money I would have spent making payments on an APU and upgrade to a quality engine in time.