I traveled with both my Radrovers on my Saris Platform rack from ABQ to Grand Canyon back in November/2016. I was anticipating some rain when traveling at +75 mph hwy speeds, dust/dirt, or just morning frost if I couldn't take the ebikes indoors at night. I removed the rack bag, battery, seatpost/seat, and aux headlight.
I did:
- White Lightning Chain Johnny:
https://www.performancebike.com/shop/white-lightning-chain-johnny-40-0707
- Added the Luna Cycle triange bag to cover the battery/tray area:
https://lunacycle.com/batteries/battery-bags/luna-cycles-triangle-battery-bag/
- wrapped the handlebars and LCD in Sarah wrap and secured ends with clear packing tape. Looked stupid; but, didn't want driving rain or dust/dirt in the brake handles, gear shift, PAS control, or LCD display with USB port.
- stuffed a rag into the empty seatpost
- Had a travel bike cover that enclosed the two rovers and platform hitch if the weather really got bad or use for added security at the hotel:
https://www.amazon.com/gp/product/B000WENDUS/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
I felt a lot of drag at 75 mph with the bike cover with two Radrovers on the back of my large SUV and opted not to use. I figured I would only need at the hotel or extreme weather situations (also at a more reduced hwy speed for less drag in bad weather).