Mine were a piece of cake !
Just grabbed 4 wires, 4 plugs, a set of channel locks, a plug wrench and some silicone spray, and crawled under the coach, leaned up against the tire and went to work.
Each side took about 30 minutes, and drank a beer at half time..........
Mike in Colorado
PS; I used the "UltraRV" plugs and wires. The OEM sets are junk.
2004 Fleetwood Pace Arrow 37c,(Jezebel) Ultra RV ECM / TCM, Bilstein's, Sailun's & Sumo's all round, pushed by a 2014 Chrysler T&C.