The difference between 13 and 14 feet will seem like 10 when you get stuck inside for any amount of time. (like a rainy day) Personally, I would not own a trailer that is not a double axle, even my boat is a tandem. I think they tow better with less bouncing. If all that is available is wet bath, then that what you get. They do not take up as much room as a full bath would. On a 13 or 14 ft trailer, all space will be at a premium. My boat trailer has surge brakes and they are not as reliable as electric would be. Surge brakes rely on the weight of the trailer to stop.
I love Livin Lite and what they do. I have never heard anything negative about them.
