What horror stories? Plenty of good equipment out there. Check out the peavey max110 or 112. Peavey = reliable. Big enough to sound like a bass but still small combo's. Will consume 50-75 watts from your inverter to make their 20-35 watt output. The older minx110 combo's sounded surprisingly good too for being so small if you run across a used one of those. The newer ones have a couple more features like tape in/headphone out, etc.
Peavey :: MAX Series
Or just play through whatever you find at pawnshops until you find one you like the sound of, isn't too big and doesn't draw too much juice.
BTW, it's cool you're doing all this in a big rig.