Double check that fifth-wheel is locked into the hitch... good! I am currently on a trip and I cannot begin to tell you the number of people who have pulled out of campgrounds without checking their lights. Unreal. Being solo, I at least do the 4-ways and usually the headlights, too.
As someone above posted, please do not exceed the rating of the tires. A neighbor told me he was doing 75-80 up I-95 (with a fifth-wheel) and had a blowout. Glad I wasn't next to him.
Enjoy... sounds like you got it covered.