They used to use large Avons in the Camel Trophy event to cross lakes and rivers - would carry a 110 Defender no problem.
What an event - anyone who watched one couldn't fail to be impressed with Land Rovers - wish they would bring it back.
Some awesome videos here - good old youtube.
Watching the original Range Rover in action is awesome - 8 jerrycans on the roof and a load of other kit - high speed driving across rough ground - on 2 wheels and they still don't go over!!!
No doubt one of these videos will show them using the boats - will post the link if I find it.