How much space is required between back of sleeper and headache rack?

I tried googling this but can’t find an answer. How many inches is required between the back of the sleeper and the headache rack. I got another truck and not sure what the recommendation is. There’s no exhaust behind the cab.

 

I found an installation guide for sturdy lite that says 2 inches from the cab. I believe on my old truck I had maybe 10 inches. The air is fully depleted so I guess I’ll do 2 inches from the farthest part of the sleeper which is a grab handle.

 

Yeah no kidding. That rack was literally a couple inches above the fuel cap. This other one is maybe more than a foot higher than the frame. I like this type of rack better and it’s only 6 months old so ripped it off my old truck. It’s open style but it holds my ladder too.

 

Looking good now. I had zip ties holding the mudflap for 6 months no problem but one broke in my pickup moving it from my old truck. I’ll go to Home Depot later and buy some bolts to hard mount the flaps. Tons of fuel space.

 

I went one week without the mudflaps and my 3/8 chains and binders started to wear the aluminum so much from vibration it I was worried it would wear through within a year. Maybe it wouldn’t but better safe than sorry. Also it keeps the noise down when you shift or brake keeping the chains from slapping the aluminum.