Not a bobbed, personal preference and apart from showing off the truck, I don't find it useful. I have been driving military 6 x 6 for the pass 35 years and we own 2 x MLVWs, 1 x M109A3 and a M35. The ML with a single axle has great tires on it but the traction is not that hot unless I have a lot of weight. The second I hit snow, I engage the front wheel drive.
As to using WMO and fryer oil as a fuel, you have not figured the costs out too much. WMO in Canada is not thrown out but is collected and recycled by big companies and as a result they pay garages for WMO, this also applies to cooking oils. Once you caculate the cost of buying or making the filtration system, collecting the oil, additives and regular fuel for octane. In my books it is not worth it. How many miles do you plan on driving per year? Unless you have loads of free oil, time on your hands, storage and separatng facilities again not worth it.
I do a lot of driving pulling with a MKT and the M35 is fully loaded with equipment for shows and it is still not worth the effort.
ALSO: Check with the local autorities, especially Revenue Canada for the legalities of running WMO/Fryer oil. You will require special permits and you will have to fill out and submit declarations on usage and pay levies. If you get caught with WMO in the tanks without the permits it is the same as using colored farm diesel and believe me the fines can be hefty. It is you decision but do some serious checking before jumping in with both feet.