First thing that is not the way to fix a broken water line, the old pipe should be cut out and a new piece installed, the way they fixed the pipe is bad for your health you could get sick from con taminated water, call the local health dept. and report it. As far as the smell it coild be wax ring, are it could be loose are bad connection to the sewer under trailer, sounds like you live in a park where anything goes wheater it is right are wrong, better have and inspecter come out and look over park, let me know what happens.
Art retired plbg