If you can get 12-volts-DC to it, please consider getting the electronic ignition model SW6D. The ease of lighting it and shutting off when the water's hot is well worth the cost. You'll save LPG since you'll tire of getting out to light it on demand. Then there are the times you think you have hot water and find the pilot blew out.
We have SW6DE, electronic plus 120-VAC. We can't use the electric all that often in summer because of all the current draw on our 30A system. Nice but I've found 120 isn't essential.
EDIT: Don't replace Suburban with Attwood. Or vice versa... They require cutting or a cutout adapter.
I don't think the new heater will come with a door. Hopefully the one you have now will fit.
EDIT TWO: Anchorage... Many "free shipping" deals are Lower 48 only. Is Mobile Trailer one of the places you've checked? I've bought there and been pleased. Also heard good about Karen's.
