Let’s just say that for taller people like you and me, the shooting platform extends onto the lowered gate when a supported (bipod) long rifle is employed.
This is for the most typical ‘suburban cowboy Cadillac’ crew-cab truck that has a slightly shorter bed than a work/farm truck.
A .308 [AR-15] set up for wild hog hunting is an excellent “all purpose” firearm, shall we say.
[ p.s. I need another trip to Whitey’s Fish Camp and Pontification Center with you and the bride ]
Correction: AR-15 should read AR-10. We regret the error.