Ah you definitely need one then!

You'll probably need one that takes a crate with wheels, other wise you'll have to carry dog under arm!
When I showed an Affenpinscher, I had a stroller that carried a fabric crate on the top which could be detached and used on the bench and room for another dog (or 2!) in the fabric 'basket' that was permanently fixed underneath. The crate also had a rubber board that sat on top and I could use for grooming. It was only £30 for the whole thing bought at Richmond Champ show and was light and easy to store at home. I can't find anything that at the moment - they all look like prams and don't have flat topped crates!

If you buy a table with wheels, make sure that they a re BIG wheels - small ones don't like the rough terrain at show grounds.

You'd be best to look at the trade stands at Champ Shows.

Are you anywhere near Sussex??
http://cgi.ebay.co.uk/Portable-Grooming-Table_W0QQitemZ110506501193QQcmdZViewItemQQptZUK_Pet_Supplies_Dogs?hash=item19bab36449