Welcome aboard Shroomapotumus,
I have never been to Colorado but am a Denver Broncos Fan. The UFO you report, the Triangle UFO, did it have a light in the middle of the Triangle? I am a former Marine and my last 4 years of Active Duty, I was an Air Traffic Controller. Back in 1998, just after release from Active Duty, I was helping my sister move from Olympia Washington to Texas, and saw the Triangle UFO similar to what you describe. My sister was driving and we were only traveling at night due to the heat. As we traveled through Arizonia approximately 0230, I observed what appeared to be a high alltitude aircraft. I tracked it as it decended due to boredom.
As it decended I observed 3 redish orange lights at the points that I believed to be the tips of the wings and the nose of the aircraft, and a white larger light on the belly dead center. Due to the rate of decent, I believed the aircraft was about to crash. I told my sister to pull over. She slowed down to observe as there weren't any other vehicles on the road at this time.
As the craft was about to hit the ground, it suddenly darted straight up. It then darted in all directions at incredible, unreal speeds. It was at this point that it suddenly came to within 100yrds of my position. I got a close visual on it and was astonished by what I saw. It was a giant triangle UFO. It was approximatley 200-300 yards across at the back end of the triangle and 300-400 yrds long from tip to back. It was at least 3-4 stories in hieght that I could see. Needless to say it was shocking. My sister hit the accelerator and would not stop. To this day she will not talk about it.
I had never seen anything like this before this sighting or since. Incredible that you describle the almost exact same craft.