here's one i found on google. http://www.google.co.uk/imgres?q=Grimme+GT+170&um=1&hl=en&safe=off&sa=N&rls=com.microsoft:en-GB:%7Breferrer:source%3F%7D&biw=1066&bih=570&tbm=isch&tbnid=WYoKbLOV2j47TM:&imgrefurl=http://www.globalagtrading.com/harvesting/harvesters/potato-harvesters/&docid=J7I9bHmVcJYS3M&imgurl=http://www.globalagtrading.com/wp-content/images/Grimme-GT-170-S-2-300x200.jpg&w=300&h=200&ei=fPTjTunvLYL98gOJibCPBA&zoom=1&iact=hc&vpx=797&vpy=186&dur=1230&hovh=160&hovw=240&tx=187&ty=95&sig=106752782210739772866&page=15&tbnh=160&tbnw=212&start=122&ndsp=8&ved=1t:429,r:3,s:122
there is a man local to me that has one with canopy on the back. will try to get up to get some pictures of her.