I'll throw our 2 cents out there. We downsized from a 40 foot coach. We went to a T@B400. If you have the budget and are willing to wait for the build it is a very nice unit. Very good quality etc. Here are a few points that we are impressed and happy with.
- Balance. The trailer is designed with all the storage pretty much over or slightly behind the axle. The hitch weight changes very little with loading. Filling up the fresh tank actually lightens the hitch by about 10 pounds. The AGM batteries are mounted under the bed and slightly behind the axle. Really you can't load a lot of weight in a L@B anyway. There is just not a lot of places to put stuff.
- Hydronic heat and hot water is really nice. Really quiet and uses very little 12 volt, its also super efficient.
- Basement air and heat pump. No big gun turret on the roof. Helps with mileage of the tow vehicle (or in our case battery consumption and range)
- Fit and finish. Nice materials and very well done. Very european feel.
- Built in inverter, Lithium ready although we are staying with the AGM's
Here are a few pics. Not sure if you have been in one but worth taking a look. We tow with a fairly high performance SUV with a stiff suspension and 447 hp. Rear end squat is negligible. But heads up, Nucamp doesn't recommend using a weight distribution hitch so plan accordingly. Our trailer loaded for camping is around 3420 pounds and hitch weight around 340 pounds.
Hope you find your dream trailer. Safe travels and happy camping.