The idea is "doable" of making your own, however I agree the engineering needs to be considered.
Look at the back of a car hauler when the trailer is off. The 5th wheel is about six inches off the ground and is boxed tubing off the frame of the truck. That proves it can be done to haul a full trailer designed to carry four to five more cars on it, but it was engineered by someone a lot smarter than me.
The tow axle idea is great too, however one of the ones displayed is adding a pivot joint so backing just got a lot more complicated. The one that uses two anchor tow points is just making you vehicle overall length longer.
You definitely want to know tongue weights for any trailer to avoid overloading.
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