What kind of winter camping are you talking about? Does your trailer already have a more-modern AC unit or do you still have a tough old Armstrong up there? I wouldn't trade my Armstrong for any amount of heating capacity.
If you're relying on electric heat, you're committing to camping only where there's 30A power (fixed or a generator) available. If I were seeking electric heat I'd prefer a space heater (1 on "High" or 2 on "Low"). You'd have a similar amount of heating available to you, your capacity to heat wouldn't diminish as the outside temperature dropped and it would be MUCH quieter.
You'll still be giving up the ability to heat the tanks under the floor, which in Texas is more of a theoretical advantage than a necessity, but there it is. I chose to go back with a modern iteration of the Suburban furnace in my 28' Argosy that's currently without any heating options.
My friend Lance (Top
) has mentioned the Propex heaters,
an interesting alternative that's likely to be enough for Texas, though they're pricey. I'd seriously consider taking that route if I didn't already own an NT30, though. They can mount under the floor to save your cabinet space and use very little 12v
power, and each one is about 2x as powerful as a 1500w electric heater. I think it would be enough for Texas.