Nice truck. Youre going to like the 6'5 bed for that bike. I have the 5'5 bed, and with my quad in the back, I cant close the tailgate.
As for mods, its whatever you prefer, or in my case what i can afford.lol
If it doesnt have an exhaust maybe start with that. I personally would go with a level kit if your going to be loading that bike. A little bigger tire, maybe some rims and youll be good to go. Nice the way it is though. Oh yeah, welcome!