You're lucky. It appears that your trailer can weigh up to 3,000 lbs without brakes in W. VA.
Did you check to see how much your tow vehicle can stop? It's quite often less than the amount that the vehicle can tow.
When I first started building, I was driving a '96 Toyota Tacoma (gone, now). It was rated to tow 3,500 lbs but could only stop 1,200 lbs.
I weighed everything that I could!. The 5x8.5' trailer's initial weighing came in at 1,127 lbs. ( I've since added a couple more things, bringing it up to about 1,160 lbs. )
My build was made with a 1/8" plywood sandwich with3/4" Styrofoam as the "meat". A 4x8' piece of 1/8" plywood weighs approximately 9 lbs. Figuring 36 lbs for the two sides (9 lbs x4) and another roughly 20 lbs for the front and back 5' wide plywood walls; plus, let's say...a generous 30 lbs for the roofing system plywood adds up to only 86 lbs of that 1,127 lbs.
So, what I am saying is, even though you have a very generous state allowance of 3,000 lbs and are planning on building a 5x11(?) foamy, the weight can add up quick. It's kind of like stepping on the scales after an "a little won't hurt" Christmas and suddenly, you're saying, "Holy Smokes!"
The above said, Forum member, Alligator, built a 6x11" foamy with a lifting roof and it came in at 1640 lbs; so, you'll probably do just fine. In case you're interested, his build thread is here:
viewtopic.php?f=55&t=49879