I have used this homemade moped rack that I fabricated 10 years ago on my latest truck. I have used the same rack on two other trucks and it always fits with minor adjustment to the Clamps. All aftermarket additions have to clamp to the trucks frame rather than using bolts as your not allowed to drill holes in a commercial motor vehicle truck frame.
I used a old barbecue cover to keep road sand snow and salt off the bike but after a week it tore to shreds and the bike was soooo dirty I didn't even want to bring it down for a ride.
Here is the ped visiting a great park. I can't remember where. A bike cop told me not to lay on the grass with that "motorcycle". He was the only police I saw in that whole town. Not one singe police car on the trip from the Truckstop to that park.
Yes mopeds are the greatest for striking out and seeing beautiful places and great things.