I agree the BOB is not so good for general haulage. It was alright bringing home a bag of dog food. It was terrible bringing home anything oversize though: had to walk the bike.

I bought a used kid trailer with a ripped top. Took the nylon top off and put a dog crate on it (with rubber hose clamps). This worked excellent. Attached is a photo hauling some garbage to a dump. It definitely cannot handle the loads bikes-at-work trailers can, but is decent.