I was having this conversation with a guy at work tonight. There are really no wrong answer with 1 or 2 axles. I like the look of the dually myself. We started to do the guy thing and figured car haulers do not have dual tires if they carry more than 2 cars they go to 3 axles normally. The truck will not have anymore tires out back , only 4 tires to carry the weight. if the spring rate is the same and tires have the same rating what would be wrong with 2 axles. As long as the bearings and axles have the correct rating should be ok. Or are we way off in our thinking? Just talking weight rating.