I have one truck with GG ATs and one with BFGa - and rate the GGs over the BFGs - they have a similar tread pattern, wear characteristics and such, but at less than half the price, it's a no brainer for me when it comes to some new 33"s.....
Have a look at event-tyres.co.uk - they will come to you...
I used to have GG UHPs on to start with, and went out for a day with Paul Humphreys in N Wales, including Whitestones, Phesent Pen steps, V Gulley and so on - on road tyres, and got on just fine!