I would definitely not trust that on a tailgate pad. The weight of it will make it want to sway side to side, and only having a velcro strap won't be enough. You could use tie down straps to supplement, but I'd rather use a tray type of hitch rack.Our e-bikes weigh 65 each.
Also, with a hitch, I'd mention that Kuat has a ramp you can quickly attach and remove:
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