As more PT Spears are built, the question of an ideal dolly has been asked. Recently, Russell and I joined friends in Port Townsend for a day of sailing. Our friends both own PT Spears; the one-piece version of the PT 11. Each are transported differently. 
"Pato" arrived in this truck. This is actually an older photo on a day when we left from the launch ramp.
"Rascal" has its own little trailer.
Both PT SPEARs have dollies since their humans often launch by themselves. One uses a kayak cart purchased from our local Pygmy Kayaks. We found that the kick stand on this particular cart was a little tricky to get to and adjust with the dinghy being wider than a kayak.
"Rascal's" human, being a plumber by trade, created his own sturdy dolly.
PVC pipe with a fixed "kick" stand. Sturdy and always in the right place so no need to access to raise or lower.
I also found while writing this post, that there are thousands of images online for kayak and dinghy dollies. It is important to note that the PT SPEAR, at 85 pounds, is easy to manage with a very simple dolly (like a kayak dolly) compared to most of the more complex dinghy dolly designs shown online. UPDATE: One customer has offered his design and details for a PVC dolly he uses for his PT SPEAR: PDF HERE
A brief clip using the PVC dolly:
AEB 😉