Being the owner of a 2014 Epic III 3800....
Here are three things I would check first:
1. Is the bedroom bed mattress supported on both sides. Ours, the OSB platform the mattress rests on came within about 2" of the edge of the mattress on the Passenger side. I was about 8" on the Drivers side. So I always woke up feeling like I was in a "hole". I made drawings for the fix and can share them if you like.
2. The garage bathroom toilet flushes straight down into the rear black water tank. Have someone stand on the flush valve so that you can use a bright flashlight and look down the toilet to the tank and make sure there is nothing there causing restriction. Ours did, dealer did something, and never told us what it was. But fine now.
3. Just use water to put a about a 25 gallons in the bedroom grey and black water tanks. Then check over a time period, say a day, and make sure the valves hold. These two valve handles are in the "wet cabinet" on the outside. Make sure the valve handles go all the way in smoothly, pull out smoothly, then go back in smoothly. Ours did not...and when you're leaving, you take the cap off the drain pipe and ...surprise!! Here's the link to the post I did on replacing them with Valterra electric valves...which I strongly suggest before you start using the trailer:
http://www.dutchmenowners.org/forums...lves-2682.html
That's all real "issues" we've dealt with in our first 5 or 6 major trips in the first year of ownership!
Pirate