Electric heater problems.

I go with the converter solution IF you have controls set properly. I have use a 12V trickle charger (relatively inexpensive) to verify and supplement a weak inverter. Since you said your hook to AC you have power for the trickle charger.

http://more119.gorumanuals.com/terry-travel-trailer-owners-manual-1996-moperpv.pdf

Sounds like it needs to be serviced. Contact your local service center directly or online here:

Try this Contact your local service center directly or online here:
Coachmen RV Manufacturer of Travel Trailers Fifth Wheels Tent Campers...

At yr breaker box if there is room add either a new 120v or 220 breaker and wire frm there. You need to check how much voltega and amp. Yr travel trailer needs. Plus how far away breaker box is frm trailer and get the correct size wire if needed. Make sure you have neut. And ground correct. Please doulble check. What iv offerd. For yr solution

Most all travel trailers are set up for 30 amp single pole service which means 110 volts. Always check with your service manual and make sure, if you hook it up wrong you will burn up/smoke some electronics and it can be a costly problem. Also, a 30 amp service for travel trailers are not like a regular receptacle, it takes a special type of recept. Most any good electrical supply store can lead you in the right direction but you MUST know how to wire it up to code in your area! If your not a licensed electrician or at least know what I am talking about, I wouldn't recommend you doing this! It may have to be done in GFI and/or waterproof connections.

I have no idea what you're asking.
Contact your local service center directly or online here:

A TRANSDUCER WILL STEP 220 DOWN TO 110 .
I BELIEVE AN INVERTER WILL BOOST IT FROM 110 TO 220 A ALL IN ONE TRANSFORMER WILL WORK