Coming over all health and safety for a second my priority would be to focus on the condition of the wheel bearings and tyres, that is your biggest safety issue. As for the type of cover I trail with a heavy over-boom cover which has never shown any signs of flogging so I wouldn’t buy a trailing cover just for the purpose unless I was doing a lot of mileage. (I would admit there is often so much camping gear in there it couldn’t flog) (obviously all light stuff……. 😈 )