Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
The OP asked for alternatives, I posted one that's readily available and half the price. The Red Dot R-6101 is advertised as an on-highway unit for trucks. Though, I can't find any documentation to back that up...
Anyone who has spent time on forums has seen something, somewhere that's posted...
I think you could install a rooftop unit with a compressor for $1600 - $1800.
http://firewall.reddotcorp.com/pdf/R-6101%20RD-5-15506-0P%20Product%20Sheet%20v3%20WEB%20ONLY.pdf