beags86
Adventurer
There is a company in Germany that makes an aftermarket bumper for the G-Wagon that is a 50L water tank. I have looked in to the idea myself and found that it takes much more than swaping bumpers I would need new springs and stearing damper.
The shop company is Desert Service
http://www.desert-service.com/shop/index.php?cat=c7_Bumpers.html&XTCsid=ht16hnbsokckdkt3o30ds4tpg1
thats sort of what my mind had came up with, only it wouldn't replace the bumper, just go in front of it.