From Pasco, WA to Provo, then South Route East

We tried to go thru Colorado & Kansas but seems to be a lack of rv parks after leaving Denver area going towards the middle of Kansas ... just really a******shoot trying to get past Salt Lake City and ending up in Manhattan, KS.

Thanx for the input though from everyone .. gives us more options and something to think about .. and not really thrilled about going on 6% grades even with a 3/4 ton Suburban towing an 18 footer (just for this trip only).