There are a ton of the old hardtop tent trailer frames kicking around and they also make a good base for building your own trailer. Get one that has the torsion bar suspension, they take a heavy load, trailer good and bulletproof.
Don't feed the bears no matter what they tell you!
After much research, I decided to take TOOMANYTOY's suggestion. I purchased a harbor freight 40.5"x48" trailer capable of carrying 1,090 lbs. for $200. It came in two boxes that I was able to easily transport home in my RAV4. With another $100 worth of lumber, hardware and sweat I was able to construct just what I needed.
I didn't install the included lights since I won't be taking it on the road or the included fenders to keep the width down to 52" to drive through our woods behind the Pioneer. I am able to easily remove the front and back gates to haul long pieces of brush. The 12" wheels track very well through rough terrain.
Thanks for the tongue jack suggestion. This is my first trailer and I can see where one would be very nice to have instead of the block of wood I've been using. Also, I found these corner connectors on Amazon for $15/pair. Perfect for making it easy to slide my front and rear gates off and on . . .