This is the original set up when my wife and I road it from Tucson to Vancouver, BC. It’s a Burley built in Eugene, OR that we purchased used from a bike shop in Jackson Hole WY.
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After removing the rear pedals and seat post I welded a rack with angle iron from and old bed frame.
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A piece of pipe the same diameter of the seat tube holds it in place and I also welded a tab on the front that clamps to the top tube with a hose clamp and a old piece of inner tube to protect the frame.
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Loaded with two chainsaws, hand saws, pole saw & pole pruner, ropes, harness, helmet, lunch and water.
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I was pleased with how well it handled and the stability of the load. The weight was noticeable at the take off and going up hills, but otherwise once it got rolling it was easy to keep going. I had big plans for side rails off the rack to hold things lower but there was not much reason since it holds the weight where the bike is designed to hold a second person and is lower profile than a rider. Now I figure a frame bag inside that big rectangular space below the platform would be the ticket.
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It works well for shopping too. I originally installed the wood platform onto the rack just to test it out but I liked how versatile it is and how well it works so I’ll be keeping it for now.
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Loaded up to go teach a pruning class. I’ve since cut the middle out of one end of the crate and strapped it behind the seat to be able to easily carry my short handled shovels with the head in the crate and the handles strapped down.
thepedalingarborist 
You’re hooked, aren’t you? I love that bike – I wish I was tall enough to manage a bike that could hold that much for commuting. I really want one of those ‘long tail’ bikes I’ve seen