If you plan to buy from Camping World join the Presidents Club first.
Then just bring your Credit Card and start walking each row and fill up your basket.
Black water tank cleaner and oder eater.
Tire Chokes and wood to level tires
Oh a 6" or 8" bubble level at the 98 cents store also pickup paper plates, utensils, plastic cups, coffer mugs, etc. Oh look for BBQ grill utensils.
That's just a few things.
All the rest is optional