If you are looking to buy, we found travel two horse boxes very helpful. Their website is updated regularly.
We eventually bought a 3.5t from a private advertiser through Horsequest but also checked out horsedeals and horsemart regularly.
Also there are a few on ebay.
As always its buyer beware though, do as much checking as you can before buying and i would always view before buying. We drove 200 miles to see a box that turned out to be older than advertised with a smaller horse area than advertised.
Take a tape measure!!
