[Aussie Mike]

The Defender would certainly be strong enough. They are built solid.

You can get the TD5 ECU reflashed and they make significantly more torque and power. I had mine done a last year and it transformed it. It makes the same power now as the new TDV6 but my Disco 2 is lighter than the Disco 3 so it gets along OK.

The later series 2 Discos have a larger intercooler and the ECU can be reflashed rather than chipped. standard they make 101KW and the reflash takes them to over 130KW with more than 400NM of torque. The Defender should produce similar numbers.

I'd get on some of the 4x4 forums and ask their opinions. A lot of these guys use them to tow big caravans around.

Cheers