I would suggest a stove smaller in size and in output. Something like the one I have, the Baby Countryside....burns corn well and also pellets, takes up almost no room, etc.
I would not buy a bigger one and burn it low. The MagnuMs are available in 12V or you can set up a UPS, etc.
http://www.americanenergysystems.com/babycountryside.cfm
Note - some deals on eBay on this stove for about $1200. I paid closer to 2 grand, so that is a steal.
Some other companies sell small pellet stoves also.
Note: check the manual and listing to make sure of mobile home use....in any unit that you choose.
You might be able to run it into the same chimney, but the installation must be tight...pellet stoves use forced draft, unlike wood stoves. Also, you must use outside air in a mobile home (the unit should cover that in the directions).
Maybe others can suggest some additional small models, but given a budget and a small size area, this one may be hard to beat.