Hi all,
My family and I will be driving from Kansas City to Salt Lake City in a couple weeks, and I am looking for a cheap/free place to camp somewhere in between. The route we take will depend on where we camp. I'm pretty flexible as to the particular location, but would like to keep it generally somewhere between the two cities. I'm not very familiar with the route and could use some help finding a good spot.

This would likely be somewhere in Colorado, but would also consider Kansas, Nebraska, or Wyoming. I'm pretty open-minded, but if I had to say, my priorities would be safe, close to the route, inexpensive and scenic (in that order). It's only for on night, so it doesn't have to be perfect.

Any suggestions, tips or comments would be greatly appreciated