Our toilet has a horrible smell coming up from it,I need to know some ideas on how to stop this.we are hooked up to a traler park system and the smell backs up in the bathroom

The toilet has a built in trap, better known as a water seal. As long as there is water in the bowl, you should not smell anything from the sewer system. Make sure that there is enough water in the bowl to cover the hole in the bottom of the toilet. I suspect your problem is a bad wax seal between the toilet and the floor. If it is leaking, sewage will accumulate between the floor and the underneath of the toilet, where you can't see it. If there is the slightest bit of moisture around the base of the toilet where it sets on the floor, that is your problem.

I agree, good answer.