Note that for a single ebike Harbor Freight Tools sells a 400 LBS capacity motorcycle rack $139 that I used and converted for my Rad Runner Plus Ebike to be able to transport it to different trail heads in Ohio. Ohio / Erie tow path and rails to trails. The only alteration required is to change the rear tire pocket position by moving one of the pack rails unriveting and re-riveting to the same spacing as spacing as the front tire and then adding a new hole for the spindle lock bracket. This rack works out really well and also has a ramp for easy loading and unloading with little to no lifting required to load the Ebike.
Nice build, but what keeps the bike standing up or prevents it from banging into the back of the truck?
A few Ratchet Tie Down Straps will keep it from moving.