Hiring a towcar

I've never found a hire car with a tow bracket. Certainly none of the large national companies do them. You may have better luck hiring a van with a tow bracket, although that may not suit you.

https://4x4vehiclehire.co.uk

We we had cause to hire a Land Rover discovery from the above for our first caravan touring holiday. Superb service.

Ask for Tracey. 

I'm a little late to the party here guys but yes you can. Our sister company have towing vehicles available around the UK, small SUVs, Estates, 4x4s and Commercial vehicles all with 7 or 13 pin connections.

Check them out ... https://indigocarhire.co.uk/car-hire-with-a-tow-bar/

Just had a quick look at your site. You state that there are 2 main types of tow bar .... flanged & swan neck. What you don't state is that there are 2 types of flanged tow ball, those that are suitable for those caravans with a friction type stabiliser hitch (which is the vast majority of caravans) and a standard 2 bolt flanged tow ball which is NOT suitable for a friction stabiliser hitch. It would be disappointing at least to hire a vehicle & then discover that it was fitted with a standard tow ball .... at worse, the caravan could be in danger of becoming detached if you hitch a caravan with a friction type stabiliser to a standard tow ball.