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@magnuswinwick
It'll be to do with gearing, won't it? The only way to get a gear low enough out of a standard cassette/chainring setup is to reduce the wheel size, and as you reduce the wheel size you need to increase the width to maintain traction. Then they need to increase width further to increase traction to take account of the force required to try and drag an 82kg trailer.
An IHG could provide a better ratio but 1.if it breaks, they are fucked. 2.The grease inside would freeze/like treacle at those temps.
They are only going at less than normal walking pace anyway so if they come across an obstacle it's just as easy to get off and lift the bike over it.