Always leave mine in as collision insurance as stated - works well! Wife has cussed me out for having it there a number of times. Actually hid around the corner of the house one day when she walked into it - I didn't want to walk into the verbal bandsaw. Hope she learns cause she's got great legs that don't need bruises on them.

Never heard about there being any regulations against it. Have no sympathy for insurance companies - you rear end my hitch it's not my problem - saved my insurance company from paying out on an uninsured motorist claim and saved me the hassle of dealing with it.