I agree that front/rear distribution is a problem, because the amount of stuff in the front is so variable. The
Trailer Balance Worksheet is definitely called for here.
For this situation of forward-located cargo (in the compartment, I realize there's none on the deck), one approach is to balance for just adequate tongue weight without cargo, and know that with cargo it will only go higher. Then work out the worst case of full cargo, and ensure that the tug is adequate.
Even when the front/rear balance is settled, and tongue weight seems okay, this will be a poor configuration for stability, because the masses are at the ends (the middle has just a bed and lots of air space). This is the "high polar moment of inertia" situation which has been discussed before - the trailer acts like a flywheel, so once it starts rotating (yawing or swaying in direction), it wants to keep going.
I think the traditional rear-heavy teardrop layout is great for stability if the axle is well placed, but does not lend itself well to a forward cargo load.
With the deck weighing very little, it does look like the axles need to move back, at a guess.
It might be cool if the front corners of the deck folded over, so the deck could run very close to the tug in use, but fold out of the way for towing to allow good turning angles.