I live in a 2000 mobile home, I have to bathroom , the master bath started to ddrain slower , then , bam, the washing machine water is backing up in to the master bath , seem it coming from under shower, the toilet in master bath is baking in in to garden tub, the sink is being backed up. It seem I can''t have the washing machine and dishwasher on at same time because when it drain it seems to back up into the master bathroom. Also when I took a bath in the garden tub and it drain the water would make toild rise and bubble hard , and the water from garden tub backed up into the walk in shower and under shower, and in sink, I know it under shower becase it seeking from the base of the shower. The other bath room drains fine and flush well . What could this be help I can''t afford a plumber. Please help

I hope you're handy because to fix this you're going to have to get on the roof and snake the roof vents starting with the farthest vent away from the units sewer outlet. You may rent a sewer machine at any Rent-All. Good luck, Tom