Agree with @clanter – get your facts scrupulously straight, and drop the emotional level down multiple notches. Then present the case for the business value that this center brings to the city. For example, the stable may offer more distributed economic benefit to the city than the RV storage would. (think about spending with local contractors, restaurants, grocery, gas station, etc). Survey the stable users on their spending habits when they’re at the stable-- how often do they buy their lunches in town,etc. Survey realtors to get their input on property value impact of the stable vs RV storage.
For those of you saying “it’s just people from outside of town”: it’s a prime goal of every local government to approve development that brings outside money in. So that’s a benefit of the stable, not a flaw-- as long as they’re spending money.
These planning boards, town councils, etc are flooded with emotional people who have no appreciation for the difficulty of planning future land use-- they just come in stomping their feet and saying NO CHANGE! DONT CHANGE ANYTHING! It’s so incredibly frustrating. So don’t be those people. Come with facts, show your stable’s current benefit, and understand what the RV park benefits are and see if you can incorporate some of them into the stable’s future plans.
Don’t do all of this only at public meetings-- schedule individual meetings with board members to politely make your case, listen to their concerns, work out solutions together.
Also remember that you can try to negotiate a ‘stay’-- give us one year to make xyz changes and then re-evaluate the alternate land use.