Take a short "maiden voyage" that is near some shopping area(s). As you enjoy your first outing, you'll be near a store for anything that's a "must have today". Otherwise, don't be in a hurry to buy a bunch of stuff. But, the following items are on my "must have" list:
1. Extension cord for your main power cord. It should be the same gauge as the cord attached to the trailer, not just a typical heavy duty cord you would have in the garage. Buy it before you leave!!
2. Have at least 25' of water hose!
3. Although I was lucky for the past 29 years, with the electronics in trailers now, I would by a really buy a good surge protector that also protects your trailer from low/high voltage and improperly grounded outlets. They run over $200, but cost far less than repairing/replacing your AC unit, refriderator circuit board, or power center. I just purchased the Progressive Industries PT30C...found it for $230. Do some searching on the topic and find out how many people have had problems with power connections in campgrounds.
4. An extra length of sewer hose.
5. Make or buy some leveling blocks!
6. Wheel chocks!
7. Make a check list for hooking up and the reverse. There are some apps available for tablets/cell phones. You can probably find a stock check list and modify it for your trailer and tow vehicle.
8. Never, never back up with out someone spotting for you. I made the mistake of trying to back up my then new Sunline trailer in our driveway....didn't think about the garage roof overhang and gutter attached. One gutter spike made a nice little hole in the aluminum siding on the rear of the trailer. Boy, did I feel a little sick and stupid! We learned to use two way radios back then, but today, cell phones work fine!
9. One comfy folding chair, complete with drink holder should be available for the driver and captain of the camper!
Enjoy your new trailer, and start making some great memories!! You'll be surprised at how fast the camping times fly by!!
2012 Newmar Bay Star 3302
Blue Ox Avail
BrakeBuddy Advantage
2015 Malibu
"Get busy living, or get busy dying."
Andy Dufresne, The Shawshank Redemption