There is no best brand hitch....or truck..... or trailer..... or wife :).
A. No a slider may not be necessary for several reasons.
..GM trucks has the longest cab to rear axle (CA) dimension of the other truck brands. Many GM owners report they do not need a slider (6"-10" clearance while backing) with a particular trailer profile.
.. The trailer may have a notched/rounded front corner profile designed for short bed (6 1/2') trucks.
..pin located zero over the trucks rear axle...all the above are a player in determining if a slider is needed.
B. too many variables to say any brand hitch will have enough height adjustment. I always buy the trailer I want and make mods top the truck or trailer for a level trailer.