Attached Link: http://www.planit3d.com/index.htm

go to the Meshes link, then Misc link. Helmut Schaub Circus Tent, Office Wagon (circus), Ticket Wagon (Circus), Animals Wagon cage (Circus). there also wagons and gypsy wagons that could be also "circus" wagons. All meshes are 3ds format, some with maps, some without. they import into Poser pretty well. all Helmut Schaub's other models and stuff is history, great modeler that gave up on the Poser community unfortunately. anyway, my contribution to the circus search :)