Can't really help with your question. But if your parked near another RVer maybe they can be bribed to help.
This may be worth a try though , approach the facility about your problem and ask if the rule is to do with fire hazard , or possible damage to the arena floor. If the rule is about floor damage they may allow you to set up a catch tray, for any possible acid leaks.
If it's fire related , then they probably won't budge.