Does this make any sence?

I'm throwing this out there for anyone who could explain this...why would a toy hauler have it's wheel base more in the middle of the frame where as most of the weight could or would be stored towards the rear of the RV? Semi truck trailers have their tire sets at the rear of the trailer(yes more tires) ... but WHY? Would it make sense that if you haul a heavier load in the rear that the tire set is closer to the rear to the overall load of the trailer? Why don't we use the dually tire sets on these bigger RV's?? Construction trailers use the dual tire concept am I missing something or stirring the pot?

The pin weight would be much higher if the toy hauler's axles did not carry most of the load. Eighteen wheeler trailers that can weigh up to 50,000 pounds or so can slide the tandems (move the trailer's axles) to distribute the weight between the truck's axles and the trailer's axles. Toyhaulers typically do not have that provision. So, the manufacturer must place the axles where it has the best fit for carrying the weight for most circumstances. I am sure most toyhauler owners would not want around 6-9000 pounds on the pin if their hauler weighs 18,000 pounds because the toyhauler axles are as far in the rear as possible.