All Phoenix emission testing stations are capable of handling a motorhome under 45'. Those older stations without height clearances or dynos spaced to short have all been relocated to bigger quarters. Make sure you check the wait times (they all have live camera feeds for you to watch) before going to a specific station. No sense going to one with a long line of seniors and their motorhomes when another 12 miles away has nobody waiting. Also, you can't take a Maricopa county vehicle to a Pima station, Pima can be done in Maricopa county but not the other way around. Otherwise, no other county requires emissions..