The only thing that puts me off C is its not viable to leave it on all the time (I think)

The only time I take my hitch rack off is when I’m towing a trailer, which is only a few days a year. My rack folds up pretty tight to the truck.

See here for pics.

C– same reasons as others have posted. I have a Raxter Racks 4- bike version and a Honda Ridgeline truck. I wanted a Twinny Load rack but came across this one for a good deal. Sure, I can get hit from the rear by another driver (a good chance of that happening here in the USA) but that’s okay because they’ll just buy me a new bike.

Hitch mounted also allows me to have full unrestricted access to the truck bed. If I need to tow something, I have a set up that allows me to mount the bikes in the bed while the trailer is hooked up or I can slide ’em in the back of the truck cab, if there’s not 4-5 people with me.