I don't think you'll find any roboteer on here suggesting that fighting in car-parks is a good idea, regardless of whether they're just rammers or not. A 13Kg robot is a very different matter from a RC car hitting you in the leg/shin.

Of course what you do is entirely your own choice, however seeking support for doing this, on the FRA Forum when the FRA are the advocates of ensuring things are run safely is probably not the best place to seek support.

Maybe you should read the FRA Arena Build guidelines

http://www.fightingrobots.co.uk/documen ... Safety.pdf

There is the concept of a 'Class 5 arena' but even this is far more than 'just a car park'