I recently mounted my 7″ Garmin on my wheeler, using a smaller RAM mount I had laying around.
I installed the ball on the fender, then laid the arm down to the rack and put two zip ties on it to take the jiggle factor out.
If you’re mounting with a ball alone, you’ll want the biggest RAM (2.25″? off the top of my head) and have the ball on something rigid (like the rack or handlebars).
Attachments:
PXL_20221204_200859793.MP_-scaled.jpg
PXL_20221204_200851785.MP_-scaled.jpg