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I have an older Surly Big Dummy (with the curved top tube) so it was designed to fit all the xtracycle stuff. I was lucky to buy it secondhand with all the bits I needed on it, the only thing I've added is the front wheel stabiliser.
My u tubes were fabricated by really useful bikes, but everything else is xtracycle stuff. The pannier bags and U tubes are ace for carrying shopping, stuff or bagging and dragging another bike
It's running a hub gear which is great for being able to change gear when static. It's definitely more draggy than a derailleur set up though.
Ute's often come up on eBay, usually in 18in rather than 20in size. The only thing I heard about them is the 700c wheels put the load slightly higher up than on 26 or 20 inch bikes.
I like the idea of getting a hooptie but in practice it would make the bike much bigger to store. The U tubes, being low, don't take up as much space when trying to get past the bike in my garage, and I have a wide and curved stoker bar on it which both kids can hold onto when on the bike
I have the xtracycle kickback 1. It's an excellent stand but sadly no longer made
If you fit all only xtracycle stuff to a big dummy frame then I think it all works fine, but if the surly cargo kit is fitted the xtracycle stuff isn't guaranteed to fit
I heard the guys that designed the big dummy left when qbp bought it and the relationship broke down at that point. So it might work but xtracycle have their own bikes now so focus on that rather than looking at compatibility with other bikes