E-bike transportation

I don't have a toyhauler but I carry my E bikes standing up as normal with one of the kickstands down and bikes bungeed together via the seat poles. Bungeed together the bikes stay upright pretty much on their own. I then close both of the opposing slides and bikes stay snuggly safe for the ride.
I do add a couple more bungees for good measure. My system works well.
If I had a toy hauler, I would do the same, and strap bikes to a side wall.