I am used to hauling heavier, bulkier dual sport machines like the BMW 1200GS on trailers. As a result, I am surprised at how little Vespa riders tie down their scoots to prevent movement. This is not a criticism of any individual, merely an overall impression from what I have seen at Trailer and elsewhere on MV.
It would seem that riders rely on straps from the bar ends only, to a point somewhere either side of the front wheel roughly in line with the axle. This to me is an 'all the eggs in one basket' solution as the rear of the scoot is not secured and there is little (if any provision) to prevent toppling.
I do regard a front wheel chock as vital and securing the scoot in the chock to prevent it rolling back under acceleration is essential. The vector geometry of these two straps is normally rectangular, meaning that one is relying solely on the chock to fully secure the scoot against toppling. This may be fine when loading, but I question the wisdom when hauling for long distances.
When one has to brake hard in the towing vehicle, the mass of the scoot will cause the scoot to lift, rotating around the front axle and lifting the rear of the scoot. This could cause the rear wheel to shift position and move out of alignment with the front wheel. That will result in one bar end strap being loaded more than the other to counteract lean in the opposite direction as the rear wheel shift.
In my book, securing the rear wheel for both side-to-side movement and up-and-down movement is necessary. This could be done using a channel attached to the load bed, or by strapping the rear wheel down - preferably both. The rear shock lower mounting points are fairly accessible to attach a looped end strap for this purpose, or one could just run a strap through the spokes of the rear wheel. I have also seen a dealer transport scoots by lifting the rear to put the scoot on the main stand and tying down the rear wheel, but the concentrated point load at the main stand must then be considered and additional support provided on the load bed e.g. in the form of thicker plywood at that position to disperse the point load.
My greater concern is for toppling. The front tie downs will not act to resist toppling for a substantial arc of movement. To effectively counter toppling, a diagonal strap is needed. I have seen some riders strap from the rear hand holds, but this brings the strap into contact with the bodywork and chafing of the paintwork is a real possibility. The best I have seen on a conventional trailer is a strap from the bar end diagonally through the foot well to a tie-down point on the opposite side of the scoot. This will directly act to provide tension to resist any toppling movement.
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