did it fast cheap and easy , by a pair of 12' 2x8 cut in half, take your 6' sections, square them up on each end to provide clearance as well as a brace in the center, this will clear all hull features. build both braces for under 20$, they are light and i also use them on the shore when its rocky as a stand/makeshift dock.
when i am done, the wife gets 2 new planter boxes..this size will also place the nose of the ski flush with top of truck box for added support. i did this with an octane, which are wide, and an old SN.. couple straps and good to go.. also, i usually place my gear ie wet suit life vests etc under the ski in the wood box and fuel cans fit under ski nose at front of box.. pics attached, the small brace you see in pic 2 is to prevent things from shifting around in the drive, did not want a permanent fixture in my truck and secondary use on rocky shore from pic 3 is why.