We just returned from an out-and-back to NV, AZ and UT. Left the 20th of April and got home yesterday. FWCs sighted were:
On the 22nd and 23rd In Valley of Fire SP, NV - a Silver Spur Hawk on a dark colored full size pickup at Atlatl CG and a Ranger on a pickup I didn't catch at Arch cg.
On the 24th at Lynx Lake cg near Prescott, AZ a Fleet on a red Tacoma with Maine tags!
On the 28th towards the N end of Cottonwood road UT, a custom flat bed FWC on a black? full size Ford- very shiny!
On the 30th a Silver Spur Raven on a Raptor camped near us on Spencer Flat Road near Escalante UT. (Lighthawk, I think this road is also called Sheffield Rd, you are right about the camping and the views! Amazing!)
2 May headed home on UT 12 and spied two FWCs headed S, one on a dark Tundra and the other on a white domestic make. Maybe the same couple of couples noted by MarkBC? And on the same day at the junction of I15 and US50 near Scipio UT, a very friendly smile and wave from a couple in a white pickup and FWC.