Ithink you motorhome is a 4 wire system and your Suzuki is a 5 wire system.You need to go to the BLUE OX web site under wireing. Below you will find a portion I did a cut and paste.
Two basic platforms exist in automotive wiring, the 4-wire system and the 5-wire system. The 4-wire system, most commonly used for years in the United States, has a combined left turn/brake wire, a combined right turn/brake wire and a tail light wire. All rear lights in this system are normally red in color. The 5-wire system, common among imported vehicles, has a left turn wire, right turn wire, tail light wire and a brake wire. The turn signals are normally amber in color. With these two platforms, 4 basic combinations can be encountered as follows:
2007 Sea Breeze LX 8321 Ford Chassis
2004 Ford Ranger Edge
El Cajon CA.