I have a rig a lot like this.
-if you have a propane tank and heater. You maybe able to put in a stove for very cheap. Mine was preplumbed. If you want a stove (I love mine now that it is in), you can buy one for about $50. If it is the same layout; check next to the stove for a cut out. Pull the drawer out and look up, you may be able to cut out the stove hole with a utility knife. A copper propane line maybe running next to the sink. Connect your stove to this with a simple gas line from home depot ($10). You can also check if you are preplumbed but crawling under the propane tank and look to see if there is a line running under the rig. Mine needed to be reflared and though I tried I was no good so I recommend at this point you take it to a shop and have them flare the line, junction it and pressure test it; about $100. Totally worth it.
-My rig is heavy and if the brakes were done you might go to a shop; have them check the brakes and make sure the rear brakes are in adjustment. I fried my brakes this fall because although I had a brake job done recently the rears were not adjusted and the Cali mountains fried them quick.
If you want to know about anything else let me know.
How smoking of a deal you got all depends on how long that engine lasts. Good luck.