Welcome to the JOF.
I have a different trailer so really have nothing specific. However, my valves are directly behind the water heater and I believe that is true of ALL trailers. Also, BTW, my water tank and water heater are one unit.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.