Had some road time to Lincoln, NE and back. I've found that if I load the trailer with about 100lbs of gear and the truck bed with about 350lbs...bucking is minimal.
I've been thinking about how to address gap covers between the rear of the truck to the front of the trailer. It looks like I might be able to use a 1"x6" wood board on top of the rear bumper to mount pivot points on so I can install the covers to it. The board will be bolted in place via the bumper trailer holes. The covers will be clear (Suntuf 26 in. x 8 ft. Clear Polycarbonate Roofing Panel fer about $20) and will be framed fer strength (probably the shelf rails I used on the rear wheel skirts). I'll see if I can use an iron on low heat to flatten the panels out.
Suntuf 26 in. x 8 ft. Clear Polycarbonate Roofing Panel-101697 at The Home Depot
The upper pivot point will be attached to the aero cap main bed rail. The covers will pivot out of the way when I need to gain access to the truck bed and will also overlap past the front of the trailer. Mechanical fasteners will keep the covers in place while in operation.