What isn't included with new trailer

Wow, Thanks to everyone for the list. I am sure you can get the dealer to add more if the trailer you are buying costs more. I have compiled all of the suggestions so far below. I am sure this list will help those buying new an used to help make sure they have the must have items so they will be ready to go. Here is the list. I added "Better Mattress" but am not sure if anyone has had the dealership include that. Maybe you can't access under-mattress storage with a good mattress on top.

Spare Tire
Power Tongue Jack
Sewer Hose
Water Hose
30 amp Power Cord Extension
30 amp Power Cord Adapters
Surge Protector
Transformer to Boost Campground Electric
New Batteries
Battery Box
Propane Tanks – Filled
Water Filter
Weight Distribution Hitch
Brake Controller
Towing Mirrors
Water Pump Bypass Kit – for winterizing
Electric Stabilizers
Slide Toppers
Vent Covers
Maxair Roof Vents
Water Filler
Black Tank Rinse Wand
Hitch Locks
Furnace Bug Screens
Leveling Blocks
Change Lights to LED if not included
Wheel Chocks
Generator
Better Mattress
Mattress Topper
Hard Start Kit for AC if using generator
Manual Socket Wrench for extending sliders using drill
Toilet Paper, Towel Holder, Soap Dish Holder
Refrigerator open stays for keeping open when not in use