Nick,
I shouldn't think it will be a problem, its unlikely that the tow bar will connect to anything but the chassis rails.
The only thing that might be a arse is where the pipework for the feed and filler and routed, if your stuck for any pipe or fittings drop me a PM as I have anything you would need on the van.
Stu- a: when the fuck did your car do 173 mph !!! fair play lol
b: if your handy with the fabricating I'm sure you can make some new brackets if required, not a big job at all