The v-groove bearing and T aluminium rail modification seems to be working just fine, however plant matter does still get jammed into the machine and it locks up, it is more resistant than the previous polymer wheels and aluminium track
For My next project I will try using linear rails, I tested a small section of rails butted together so I could get a 3m length, dirt and other pant matter had no impact on the linear rail
Following on from that my garden bed is in a green house, I will try mounting it on the roof rails.