REB, Do what you want and believe what you will. However, here are a couple of things to mull over. 1) The Rebel is legitimately classified as a street cruiser. Not a cafe racer, not a superbike, and not a touring bike. Of course you can attempt to ignore these limitations but it will come at a cost. 2) There is a reason there are DOT regulations and special certification requirements for transporting flamable and dangerous materials on public streets, roads, and hiways. Think back to the MSF course you repeatedly praise. Where is the highest risk of collision? Intersections, where you are most likely to get T-boned or rear ended. RonP made a joke about the tank between the legs and that is funny, but there is a huge difference between an approved tank and a petrol carry can either bolted to the side or strapped on the rear end. 3) Weight distribution on the bike should be equalized to enhance stability. I can assure you there is a difference between "dead" weight, and "active or live" weight (a container of volatile petrol sloshing around). If you want the opportunity to travel 500 miles a day (and that would be haul even for a conventional vehicle) then the safe and rational choice would be to consider a touring bike or a trike. Those that do and have strapped petrol carry cans on a Rebel are foolishly attempting to exceed what the bike is about. Remember, everything you do on your bike not only effects your safety, but most likely the safety of other vehicles that share the roadways. 4) Lastly, I don't think your insurance carrier would cover you if you transport flammable materials in the manner you have described.
1986 Honda Rebel 250cc