Newbie 5th Wheel Questions

Thanks for reading the thread.

I have an 09 F350 CC LB 6.4 4x4 SRW. I plan on towing a 5th wheel with a hitch weight of 2900 and a GVWR of 14k. I purchased a Reese hitch with 20k capacity and a 4.5k pin weight. My questions are have I done any thing wrong so far? Do I need a special tailgate for a 5th wheel? what about the in bed plug in cord that I have seen (like and extension cord)? I did order the specific brackets for my truck and not the universal. I have a factory bed liner, is it best to cut it or just do a spray in bed liner? Is the factory brake controller up to the task? I have towed travel trailers but never a 5th wheel.

I am also running aftermarket rims and tires with a leveling kit. The tires are 10 ply and on 20 " rims.

Thanks.