We have a 2013 375FL. We have been full timing in it since September 1st. We bought it used and really like it. One issue I am looking dealing with is the front television doesn't seem to be connected to the coach cable or the coach antenna. I have been connected to the satellite connection using an external antenna. I haven't had the time to research it. Make sure all of the TV's work from the coach antenna. Our doors to the bathroom and bedroom are very finicky for level. They don't always latch well. I just had an issue with my MORryde pin box slipping last week on my way home and will be needing to get new bolts and torquing to manufacture specs. You may want to ask to verify the torque. You will probably be the first for that.
Check the date of manufacture of the tires, if they are not within 6 months of delivery date, make them replace them. My tires are manufactured in Feb. 2012 and this trailer was first delivered in September 2013 so they were a year and half old at delivery. I will be replacing them very soon. Make sure the water tank holds water, run every fixture, check under sinks and run enough so that if there is leaks underneath it will show up. I had a new 2008 Cougar that was full when I took delivery, I should have suspected something was wrong when there was a lot of water on the pavement. The first time I tried to fill the fresh water, it took nearly 2 hours. The fill tube was pinched between the frame and the coach. Nobody can tell me that the dealer wasn't aware of a problem. Anyway, just a few things I have run into.
As I said, we are pleased with this floor plan, I wish it had more storage but don't we all.
I will gladly answer any other questions if I can.