From experience, wrap the elk rack and/or skull in double or triple heavy duty garbage bags. Then parachute cord and trailer ties to top-or inside. Protects rack a 4-runner top. Protects U and rack and SUV.
(I have 2 4-runners).
"The credit belongs to the man who is actually in the arena-not the critic"-T. Roosevelt There are no atheists in fox holes or in the open doors of a para's aircraft.....