Help me be a new Owner....

Drove to 5 dealers in Oklahoma today and choice is now between Momentum 385 and Voltage 3950.

Concern: 385 weight = 15500 + Apx 1375 in fluids (fresh water and fuel) = 16875 with axles rated at 8000 x 2 = 16000?
Obviously I can drop that by hitch weight of 3700 but I can also add up to 3900 to storage area and I back where I started, Over loaded?

Voltage triple 7000 axles give me apx 4000# of extra capacity using the same analogy. Should I be concerned? You guys are the only ones out there with a 2 axle design? Blowouts and flats tend to ruin what should be a pleasant camping adventure.


thx, Matt