I have bought one of these for extra storage as no integral garage. The bike rack is a fiamma pro-C and will take the box but is positioned slightly off centre at the rear of my motorhome to fit between the fridge vents and chemical toilet hatch. Should I fit the ultra box centred to the motorhome but off centre on the bike rack or centre on the bike rack but will look off-centre from behind? Thinking more about motorhome 'balance' / the rear wall / wind resistance etc when driving. Any thoughts appreciated..