Abstract: A mobile bathroom assembly with a support frame member assembly operably configured to attach to a trailer hitch and support a lower shell and an upper shell. The lower shell includes a bottom wall and a sidewall enclosing a lower shell cavity and having a lower sidewall door. The bottom wall includes a toilet assembly coupled thereto fluidly coupled to a liquid supply tank and a circulation pump operably configured to induce a flow of liquid from the liquid supply tank to the toilet assembly. The upper shell also includes a sidewall surrounding a ceiling wall and defining an upper shell cavity, wherein the upper shell is operably configured with a motor assembly to extend upwards and contract downwards with respect to the lower shell to increase and decrease the internal assembly height and lower and upper shell cavities within the lower and upper shells.