Rig-master, proheat, idle buster.. They all have one inharent problem that will never be fixed.. Complexity. What do I mean? Look in the box! There is not enough room in that box for a field mouse. They have a engine, a a/c compressor, a generator, electronics, belts and more..
You need to apply the KISS theory.. And the above units missed it completely. However, I know of a way to get you heat, a/c, and more 110 power than you would ever need. All items come with a 3 year nation wide warranty. And it's stuff that has been around since the 60's...
A low profile R/V roof air unit with heat pump and a 5500 watt diesel generator. It costs a tad more up front, but it's simple, can be fixed by most any R/V dealership (theres a ton of them). because they have been around for along time service parts are cheaper and you don't need a PHD to maintain one yourself.
I have done this conversion for a local trucking company and I have been working with a company with a few drivers here about converting the rest of his trucks. As he put it, the pro-heat is nothing but a 7500 dollar boat anchor. He has one truck setup the way I mention and the drivers have yet to complain it is not working.
If your truck is already 14 feet high or you don't have the 9 or so inches the roof unit needs they also make a under body mounted unit that can be ducted through the floor of your sleeper. Of course this requires a lot more frame rail space. Another nice thing is that a roof air unit does not require a flat roof to be mounted on. They can be mounted at a angle for some of the newer style cabs and sleepers.
Sometimes the awnser to the problem is so simple it is overlooked. Check with your local RV dealer. They should be able to quote you somewhere in the 9000-10500 range.