It would be helpful if you indicate what model White Hawk you have and a picture of what you are dealing with. If I'm understanding you correctly, the Dish reciver is too deep and would extend past the shelf depth? Might I suggest that you mount the reciever to a piece of 1/2' shelving cuto to the proper depth and width using a lenght of woven belt material (like a light duty tie down belt/buckle strap) and allow it to extend past your 8' shelves. Another thought, though it may block your IR signal for yoru remote, is to mount the reciever vertically?
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2014 Jayco White Hawk 30DSRE
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Z71 Extended Cab w/Longbed, 5.3 ltr
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