I am a home haunter, but I will give my 2 cents worth. I'm not sure if $25000 will get you a lot for a hayride, you have to factor these costs;
Repairs to tractors
Repairs to wagon
Fuel for generators
CB Radios for tractor drivers
Upgrades to tractors?
So just with this stuff alone will cost you at least $10000 or $15000, could be more???
Just brainstorming with all of this, but if you have all of this or at least some of them will help.
I know I have not mentioned all the fun stuff, props, lighting, costumes, ect...