I'm in the same boat. I went with the tractor tool tube and 30oz msr bottle for extra gas, and a better front tire (pirelli scorpion pro FIM) as crash protection for the bike My luggage solution is improvised as well: a waterproof rafting bag strapped to the back -or- a zip tied moose tail bag & back pack. I know the safari tanks are expensive but they can stand up to all sorts of abuse. It safe to assume the rotopax fuel tanks are made of the same type of plastic. For a recent off road ride I used a double layer of gorilla tape on my frame to protect it from scrapes and it did a great job, and much cheaper than the carbon fiber frame guards! Forget about protecting the plastics it's not gonna happen. A radiator guard, skid plate, and hand guards are all the protection you really need.