I have a 2.6 auto omega and was wondering what the maximum size caravan I could tow with this car is. Has anybody else had experience with this and have you any tips.
It's the weight of the caravan that is of concern, not the size. Ideally, check the kerb weight of your car (your car empty) against the MTPLM (maximum technically permissible laden mass) of the caravan.
In laymans terms, your empty car should always weigh more than the maximum permitted weight of your caravan. This ensures that the car always out-weighs the van.
As for size, a sparsely equipped huge van will weigh similar to a smaller well equipped van. As a rough guide, you will be looking for a caravan with a MTPLM of no more than 1600kg for safety but DO check your cars kerb weight first. The loaded caravan should NEVER EVER weigh more than your empty car.
That's the general gist of it.

There are now the added complications of when you passed your test against the weights of what you can tow to consider.
