New version has a pannier support frame .. which has a Bottom

'they ship with 26/or 700 wheels.

http://www.extrawheel.com/en/3/bicycle_trailer/

406-47 ought to work ..
Quote


However, please be aware that:
If your bicycle trailer wheel is smaller than 20", the load or panniers may rub against the ground.
The Extrawheel frame can support all bike pannier models, including those from other manufacturers.


Images https://www.google.com/search?q=Extr...w=1808&bih=891