Hi,Iz.
The F50 has a notice on the gear,warning people not to push up on a particular beam.Legend has it that after an F50 suffered a gear collapse,a Fokker training guy pushed up on said beam whilst demonstrating to new trainees.Sounds of collapsing aircraft and collapsing career.
The pins are put in for towing,to prevent a bump causing the squat switchs to activate the retraction circuit.
regards
TDD