Welcome to our forum.
It would be much easier to just buy a cheap flatbed and convert it yourself! Here are a couple of sites that would be more than happy to make them for you for high dollar!http://www.spadolly.comhttp://www.spatoter.com
Thanks so much Stuart!I love that second one, I could do a show all by myself! Spahappy
you might want to be careful displaying an acrylic tub outside, as the shell can potentially de-laminate, blister or even crack when left out in direct sunlight when not filled with water.
Whadda the Spa Dollies run new and used?