My friend has one, she tows the horsebox, her hubby tows motorcross bikes. They have chunky tyres and it copes well with mud, tracks & fields.
If you are looking to commute also, have you considered the Kia Sorento. We have one of them and it fits the bill well for towing and mud, but it's that bit more economical for everyday driving.
We have a Cherokee Jeep ( think it the Pioneer) Pulls three tons, looks good, true off roader, loads of space in the back, fairly good on diesel 28mpg. Bought it for £6,000! 3.5 years old!