We got this one and it's hooked up to my wife's trike and my ebike:
You just need to make sure you have somewhere to attach the hitch:
It's on my rear axle (which is the normal attachment) and on a mount point on the back of my wife's trike. You can probably just use the axle for both of yours.
Get the extra hitch so you can switch the trailer from one bike to the other easily.
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