The something that bothers pretty much everybody who has ever gone camping is the absence of bathroom facilities at the website. To put that into perspective, the next most important reason people do not camp as much as they would need to is fear of bear attacks. To get more details about portable toilets you may lead here http://www.hireportabletoilets.com.au/.
The largest disappointment which campers feel when they reach a campsite is the absence of a facility with hygiene standard that's at least at par with what they're used to at home. Situations such as these are far from the perfect experience of the wilderness and may lead to some extremely unhappy campers.
A lot of a portable bathroom is rather bulky (that is why most of these are mounted to a trailer) and may be awkward to move around as soon as you set their location.
While that might seem ironic for something which has 'mobile' in its title, it's not such a bad idea. You don't want everyone to wonder where the bathroom went in the wrong moment.
While many customers prefer to rent portable toilets, purchasing them makes sense if you would like to use them for more than a few weeks.
It only works out cheaper that way! And what do you do if you do not want the portal-toilet for the construction crew that was in constructing your garage? You sell it!
Normally the shop or the dealer that sold it to you'd consider purchasing it back. You might also help your wallet if you'd consider purchasing the bathrooms second hand from the get-go.