Considering the transportation of our two RadMini(s) via a vehicle rear hitch mount carrier but an concerned about rain water in the (likely) event that sooner or later, the e-bikes will get exposed to rain water while in transport on the carrier.

Is doing so (transporting on a carrier) safe in terms of water encroachment and if so, what steps should one take to protect the bikes, i.e. handle-bar leather grips, controller, switches, battery terminals, rear motor, etc?

If the answer is "use a good stretch over type cover" which are recommended as being the highest quality in terms of durability and lasting features?

We do plan to remove the batteries when transporting the Mini(s) on a rack.