Here is my purpose built hauler (a short bike, not a long bike, but all the extra touches that make it practical are there). I wanted a Yuba Mundo, but could not afford that.

Torker sells it as a Cargo-T, it is made in Taiwan, and was a Batavus design originally (same corporate parents). It has a center stand, and a friction lock to prevent fork flop under load. Those racks are serious pieces of hardware, considering the corporate lawyers limit the suggested load to 20 and 40 pounds. They sell a more restrained gray color as well, but I wanted to be SEEN! About $600, Sturmey-Archer 3 speed included with a right hand twist grip to shift it. (Slick hub, if you have an old one, you may not believe it.) Have not put a cyclocomputer on it, yet, so no idea where it tops out, but you can assume its geared low, for hauling.