After endless research I finally found a all-in-one 2kw unit on Amazon and purchased it today.
Says it adjusts for elevation up to 5000m. We'll see. One thing you have to keep an eye on when buying the 2kw units is that the sellers will claim you're buying a 2kw unit but really send you the 5kw version. I won't know till I get my heater and measure the dimensions. The 2kw units have a slightly smaller combustion body. I'll post back with my experience.
2003 E-350, 5.4 V8, 2x4, LSD 4.10, WeldTec 6" lift, SMB, Penthouse
2016 Beta 500 RS
2003 Honda XR250R (retirement trail moto)