The 300 mile round trip to collect the Westfield kit was bad enough in one of those. It'll be a struggle staying awake, I'd say. Drink lots of coffee! Despite the guy at the hire place saying mine was a turbo diesel one as opposed to NA and that it went "like a rocket" I doubt a 55 MPH limiter would have made much difference
And it was virtually unloaded. 650Kg of car minus the wheels, engine, gearbox, diff, suspension uprights, calipers, seats,...
Have a safe journey and tell yourself it'll be more fun in the Omega next time!
Kevin