I wrote to Honda Customer Service to ask what the dynamic capacity rating of the roof is -- meaning, how much weight can the car carry on its roof, in motion? I received this reply: "The 2018 Honda Clarity Plug-In Hybrid was not designed with the intention of carrying roof cargo; American Honda has not designed roof racks for this vehicle and using any third party accessory may not properly fit your vehicle and can result in vehicle damage or alteration and may void your warranty. We would be unable to provide ratings for the roof's cargo capacity due to this fact. We hope this information helps." I've seen many on this forum explain that "void your warranty" just means they wouldn't pay for damage specifically caused by this particular accessory. I'm not worried about the warranty. I just want to know how much weight I can put on the roof! I learned about the "dynamic capacity" term from this article: https://www.fatherly.com/gear/how-much-stuff-can-you-load-on-a-car/ I am looking at SeaSucker Monkey Bars as a removable roof rack ($450), so I'd only sacrifice fuel efficiency on trips when I actually want a roof rack. Add to that two Swagman Upright Roof Mount Bike Racks ($36 each), and an Auperto Cargo Bag ($59), and I'd have a lot of flexibility at a relatively low price. But just that equipment is 50 pounds, before any bikes or cargo in the bag. The above article says the average vehicle can carry 165 pounds. If the Clarity is well below average, or has some other unusual structural design, then maybe this won't work well. Any experiences to share? Anyone know if the dynamic capacity has been rated (maybe to fulfill some government requirement), and how to get that info?