The thought of hay wagons full of patrons driving across a golf course makes me think of pure destruction to the course.
If it has rained heavily the wagons will be leaving ruts in the course. This could cause major damage to the course which your friend might require you to repair costing you thousands.
If it were anywhere else I would say go for the wagons and come see us at TW (booth 341 Zombie Safari paintball Hayride). Its been our experience even if you rope off the wagon areas you will have customers going under the ropes to try and scare or jump on the wagons.
This can be dangerous if someone slips and gets ran over by the wagons.
I might have misunderstood your plans for the wagons and you might have an alternate route for the wagons besides the golf course itself.
I dont mean to be a downer, just know the damage a heavy trailer can cause going through a field not prepared for them.
Come see us at our booth and we can talk about your options.