Mine is the same way. Also there more tire choices available with 16" tims.I have two 8 lug 7,000 lb axles on mine '36 trailer. I like having two axles because it's less tires to buy and I get the bigger brakes & bearings on all 4 wheels.
the 5200 lb axles with 15" tires are ok but the 16" tires work better and you have more tire options.looking for a used 36-40ft gn trailer, most everything I have found has triple axle 5200lbs. Should I be worried with that? Hauling a 3200+ door car, golf cart, plus all the obvious tools and few spares.