Thought I would share how I mounted sewer hose tubes next to the propane tank
1 2x8 treated board cut to 69 3/4
4 pieces of 14 in all thread
3 50x90 valterra adjustable tubes
4 5/16x18 nuts and washers
Placed board and marked for all threads making sure that nothing would be in the way. Removed board to drill holes and did a dry fit of tubes. Placed board back in area, placed first tube and started all thread, then followed with second and third tubes. Did not screw board to frame until the end, this allowed me to get to the nuts on the passenger side. Sorry for the upside down pictures.