Well, if it was me I would be putting some real roof racks on that thing before the roof gets dented from the kayak sliding off (either during loading/unloading or simply hitting a pot hole).
Then I would put on a
Rhino Rack T-Loader so you can load and unload by yourself.
Finally, I would put a
Storage Lift in the garage to get the hull stored flat. I know people do store kayaks on their side and claim its fine, but I don't think there is a kayak manufacturer out there that says its OK to do it. Over time the weight of the boat - especially on hot Santa Ana days will cause distortion to the side its sitting on.
If you see my post under the Solo Skiff arrival, you can see my lift loaded to the gills with a car under it.