I'd be concerned about the hold-down belt buckles possibly contacting the front wing.

Is their some type of protective padding for them?

The metal buckle simply needs to be folded back inwards before being rested on the wing. It's a non-issue. I rarely need to open the bonnet, but this technique of fold back the buckle is simple. [Edit: I misunderstood, you mean the hold downs on the trailer.

I think they slot into place on the side rails]
What was the solution Taffmog to your refuelling issue? Do you know what the factory fix was?
I will update when it comes back, but I understand there is a filler cap with more holes for air to escape which stops the problem. I hope so as it's my only real criticism - I hate filling it as it takes ages and I never really know how much fuel has been delivered.