Silkiechicken, nice looking truck! You may be able to stand the bales on end to haul more per load.
I have a BakFlip cover on my RL, so I fold it up against the cab, when I load 2 bales of pine straw down end to end under the folded BakFlip, up against the front of the bed and then stand 16 bales on end (4 rows, 4 wide) in the bed. The tailgate just does close, packing everything in tight. I've never needed to put on straps or a tarp and have no problems driving on the highway at 60.
I have a BakFlip cover on my RL, so I fold it up against the cab, when I load 2 bales of pine straw down end to end under the folded BakFlip, up against the front of the bed and then stand 16 bales on end (4 rows, 4 wide) in the bed. The tailgate just does close, packing everything in tight. I've never needed to put on straps or a tarp and have no problems driving on the highway at 60.