Lots of mods to do on a new trailer! But stuff i encountered:
Our shower enclosure leaked BAD at the seams where they missed caulking some spots luckily I caught it right away and caulked everywhere including where they don't at the shower pan. You should test it before you use it.
I've heard that using the black water flush could break the vacuum breaker (black check valve located under the bathroom sink) and send water into the cabin so watch that (I'm gunna change that out soon as a precaution)
Check for TSB's and recall stuff like door lock recall (I had new locks sent to me AND they key them the same so no more multiple keys!), awning recall, leveler recall, etc.
I am going to add a range hood vent myself. You can do a search and DIY.
We bought this $100 mattress to go on top of the oem one and it fells better than our $3,000 house one!:
http://www.walmart.com/ip/Spa-Sensat...ttress/4569415
Always keep your wheels chocked when not hooked up and I don't recommend you rest the tongue jack on slippery plastic leveling pads. (I ALMOST had it slip off once)
Install a good anti sway / WDH system.
Check out my mods.
Welcome!