I'd be very reluctant to tow a square shaped trailer of any brand with a 4Runner. Most folks on here don't really appreciate the aerodynamics involved.
I'd highly recommend a smaller, high quality trailer like Little Guy's T@B line. It would probably work very well for the usage you've described. They are well built in Ohio, have an aerodynamic shape, are much lighter than the trailers you've mentioned and the price is MUCH lower. Check them out at www.golittleguy.com.
I've owned a couple of teardrops of thiers - the Silver Shadow and the T@G. Both were solid and completely problem free. I still have the T@G.