needing help with rancho adj. shocks

[IAFF2407]

needing some help, Rancho can't find the shocks needed for a non lifted '72 suburban 3/4. I plan on lowering it 4" rear, and 2" front. When I'm pulling the trailer I'll lift my bags back to stock height. Is anyone running a similar application, if so, can you tell me the shock model numbers. or can anyone tell me what the travel, top and bottom, the shocks need. I don't have access to my burb for a week. I'm kind of set on adjustable shocks with my bags, wanting a "Cadillac" ride without the trailer, and a solid ride with the trailer.

thx in advance.
Al.