PORTA POTTIE

Well I was up aaaaallllll night thinking about porta potties for the Shasta. I need a bathroom , and the pesky wheel well is getting in my way!
Here  is the style I'm interested in...
http://www.amazon.com/Thetford-Porta-Portable-Toilet-92856/dp/B006WPQN2G/ref=pd_luc_gc_rec_01_01_t_lh?ie=UTF8&psc=1


I just wish I could find a great quality one in low profile, so I don't have to step up to it...