We've put together a dealership checklist. We recently took our 2016 Jayco Seismic Wave 310 back to the dealership that we purchased it to fix 20+ warranty issues we came across. There were a number of quality control issues that caused warranty work that needed to be done. After learning some lessons the hard way, we decided to put a checklist together to help others.
Things you need to do, and we'll explain why:
Remove or Disconnect your batteries.
Make a list of everything you want them to take a look at and/or fix.
Walk through your trailer with the Service Rep and give them a copy of your list so they have it in writing.
Put a piece of blue 'painters' tape on the trailer corresponding to each point on your printed list.
Take pictures of each item so you can compare before and after (if it's a visual defect). I suggest taking a video as well.
Ask about their security system and what measures they take to protect your trailer.
Do not sign any documents that have anything stating the dealership is not responsible for your trailer if damage and/or theft occurs. Cross this out and insist they accept responsibility for your trailer while it's in their possession.
Before you go pick it up, tell them to make sure your batteries are charged if for whatever reason they reconnected them.
Walk through the unit with the Server Rep going through your list and let them show you what they did to fix/address your issues. QA is not a focus at these dealerships, they just go by whatever the Technician puts on their paperwork.