Is your vehicle diesel? If so, I would say no, depending on the size of your standard tank. You can carry diesel more safely (ie on back of CT etc) due its less explosive properties than petrol, you use less of it, and its readily available. All depends on the distances between garages on your intended routes. It's a hell of a lot of $. On the other hand, for petrol it may be an option, particularly if the vehicles requires premium ULP to run properly. My previous rig was in this category and I found PULP difficult to get + std tank was a puny 76l which for an auto V8 towing a 1.5t loaded CT is just plain ludicrous. Had a 69l auxiliary tank fitted ($2000!!) but was appreciated on many occasions. Don't really get that back come selling time though. But for the 200, 93l std tank is fine, and I have 2x20l jerry cans that go on the CT (haven't used them in almost 12 months).