Looking good up on those big tires. I think you might need to get a milk crate to stand on to get to the stair however...lol.
One thing I will share. My Tent Trailer is your standard build modern (2009) tent trailer. It is loaded up with HW heater/tank, fridge, cassette toilet, furnace etc. All of this stuff requires holes for venting and so on. On the dusty trails it quite literally FILLS with dust. Every opening gets so much dust and road spray in it that it is horrible once you get to camp. I would suggest that you come up with some removable covers, and step up the level of lid to tub seals all the way around. They also flex (yours will less on a new frame) and the gaps open up and let yet more dust in.
I am sure your trailer will be a lot more sturdy than a standard off the shelf (lot) unit, but the seals and the openings are something to think about. Maybe you have already, just thought I would share from my past experience in case you haven't?
Looks awesome!!
Greg
So many holes...