Youll ruin her on dirt roads and also your wallet.
Get something you can fun with wihtout worrying about dirt.
Eg. VW baja with subaru engine or get a Landrover convert it to SR20de for something different and run straight LPG, all alloy body, dump it and just enjoy it with your choice of 20 inch wheels and enough rubber for offroad. Use the aero screens from english cars after removing the roof and rat-up the lines.
This is my concept and if someone doesnt it do it on a L300 chassis or other similar chassis then those ugly Hummers out there wont be embarrassed by something as simple as this.