I have the same A/C as you have. I also have the heat strip, OEM furnace, and a Wave3 heater. I use the Wave3 for my primary heat, with the furnace for backup, or additional heat if needed. I installed the A/C and Wave3 myself, in 2005.
I have tried using the Polar Cub for heat several times, and must say I was disappointed. It takes a long time to heat the TC, so long in fact I even tried the furnace for preheat. The heat strip requires the fan to run, with the result being a wind chill and fan noise. The 2000 watt Honda will not run the heat strip. About the only advantage I can see is that if plugged into shore power, you might save some propane. I only turn mine on when I forget how ineffective it is. I would save the additional $50, and apply it toward a Wave3.
The A/C is worth while to me, and I would replace it if it died. It is not every trip that I use it, but it can be great. I can be using the TC, and during the day out of the TC. When I get back to the TC it is like a furnace, unbelievably hot. The A/C cools it down in 30 to 60 minutes. It can be especially nice at night, when you can't sleep for fear of drowning in your own sweat. Sometimes, during a 2 or 3 day heat spell, I will sleep in my TC when it is in the driveway, much cheaper than cooling the whole house.
Simply stated, for me the A/C is not overkill. The heat strip is pretty much a waste of time. Using about 8 amps, the Polar Cub is a great match with the Honda 2000. I would install it.
Wayne
2004.5 Ram SLT LB 3500 DRW Quad Cab 4x4
1988 Bigfoot (C11.5) TC (1900# w/standard equip. per decal), 130 watts solar, 100 AH AGM, Polar Cub A/C, EU2000i Honda
Toad: 91 Zuke