Re: Rally ????
No KOA's in Steamboat. Closest is a former KOA, towards the west end of town. Stayed there once, it's OK. Steamboat's a busy town. The hot springs there are great!
RE Glenwood, this was researched recently by Bev and Chester, but the RV Park reviews turned us off.
My vote would be for the KOA in Colorado City. MP 72 (I think) on I-25, S. of Pueblo. Big firepit. Meeting facilities. Burger and stuff on weekends. Pool, minigolf, hot tub. I would suggest a day trip that includes Bishop's Castle (google for info and photos), and possibly a side trip to the Abbey in Canon City for free wine tasting (you'll be glad you did, they have excellent wines). Decent reviews on RV Park reviews.
We stay every year over Mother's Day when KOA does their buy one get one free night.
Al S.