My old model Defender 110 had a diddy double step like the one pictured, which was clamped in place behind the tow ball. Something similar is needed for my Grenny as it’s just too much of a clamber for my short legs to get in or out of the back unaided . Wondered if anyone has come across one that works well on the Grenny (or a design that doesn’t work for some reason)? Cheers