What about cutting down a tripod stand so one leg mounts to the roll bar and the other two in the bed. Light weight and easily removable?
Or modify so one leg attaches to front grill guard and the "back" legs were modified into a wide ladder the width of the bed and mounted there?
"You're statistically more likely to be killed by Hillary Clinton than an NRA member. - PolitiDiva
"You Cannot Simultaneously Be Politically Correct And Intellectually Honest!"