When a trailer has a dual-axle, does it double the maximum load?
I do not think so - I believe it increases it 1 1/2 times
Not necessarily. The weight capacity of a trailer is not only determined by the axles, but also the suspension and the construction of the frame and body of the trailer itself. Adding a second identical axle will double the GAWR, but not necessarily how much stuff you can load on the trailer. It will certainly increase it, but it may not be double. GAWR Gross Axle Weight Rating - or - how much total weight all the axles can carry
No, but it will add to the GVWR
