I Bought Too Much Truck

There is no set of circumstances where I'd even consider pulling a 37 foot trailer with a 1/2 ton truck, so I think you'll soon realize that you did NOT buy too much truck. You might have bought too much trailer, though.

You probably also want to weigh it, because 9k pounds sounds a bit modest for a trailer that long when loaded. My 35' 5er weighs 9,200 and it's 23 years old and therefore lacks all the heavy stuff the newer ones have.