Ciao,
Not sure where in Denver you are, but you have many choices in all directions. South Denver has Centennial, northwest Denver you have Rocky Mountain (both of these airports have a large contingent of RVs), and to the east you have Front Range, also with RVs. A bit further and to the north is Erie Airpark, Boulder muni, and Longmont muni. I'm at Longmont and we have well over 20 or 30 RVs. So take your pick. Google map for directions.
Tobin