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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
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