How to unfreeze toilet pipes in a mobile home

I live in a mobile home park and that is what i do as the park handyman. The fastest way... cut the pipe with a recipricating saw and remove a long section. Knock it to let all the ice slide out. bring it into a warm shop for a while if you have to or run warm water through it. place a micro furnace near the sewer and use a heatgun if more ice is at the other end. Once things are clear, use two 3 inch fernco adapters and clamp everything back together. (i always keep a couple on hand just in case this happens) Make sure the lean is perfectly angled with no place for water to sit or this is what happens.