This was just talked about yesterday. Theres a thread going on your options. But bottom line was that there was no larger tank made due to space. There was some pictures of someone with custom foot guards that had fuel storage there. Also theres a thread on a rear rack holding fuel. Might want to do a search. :thumbsup:
I contacted both clarke and ims and they both said that they will not be making desert tanks for the 700. i spoke with duncan racing in san diego and they said that they know somebody that is currently working on a prototype. so who knows.