I had a 14RB too, but it was a KZ not Starcraft. Nice floor plan.
Mine had a Norcold 3 cubic foot fridge with freezer compartment. I had to move the temp sensor wire (it's clipped onto the fins inside the unit) on the farthest-right fin and all the way down, to get maximum cooling. I also found that I could hang a small battery-powered O2Cool fan outside of the upper external vent and the increased air flow let the fridge get 10 to 15 degrees cooler; some folks rig a computer muffin fan just inside that vent, so it sucks air from the bottom and blows it out the top.
My trailer also triggered an alarm during the first camping trip, but it wasn't the smoke alarm. It was the other one... not sure now if it was carbon monoxide or LP leak detector. When I took it in, the dealer found a leaky connection somewhere. Oh, the smoke detector always would go off any time I took a shower! I guess the moisture in the air was doing it... talk about sensitive!
You may be able to reduce the heat in the water heater area by setting it to Pilot once the water is heated for the first time. The pilot light was always enough to keep the water plenty warm for me, without actually having the WH kick on any more.
As for the burned smell that's setting off your detector, I would look for a wiring problem. Somewhere there may be some wire with the insulation rubbed off, or something like that. This could be serious; it might start a fire. If the dealer can't find it, I'd say find another dealer who can.
By the way, you could always pack a plastic container with a secure lid, which you can fill with ice and set inside the fridge. In a pinch this will keep your temps down, although it will reduce the available space inside the fridge. Or... just take a cooler (ice chest) along.
