A lot of questions come into play here. Some models of gas fireplaces can be converted, some can't. On top of that you need to look at your chimney. Not sure of code in Colorado, but in NM code for chimneys vary between gas and wood. Best bet is to consult the manufacturer of the stove and get the chimney a good looking at. Is it double wall, triple or single? Also look at clearance issues both inside the house and in the ceiling. Also there are different codes for manufactured home verses stick built.