Ive got a good idea if your interested there is a model train of the carnival i work for James E Strates i noticed this in Model RR Mag
if any one has A carnival (county or stae fair) in there layout this is a good addition some people have Ringling bros circustrain
this is better i dont know what models of rides there is but i can tell you that
theres 10 sleeper cars and 50 flat cars on the J.E.S. train
all you need is a small lot to put the rides on like grass or gravel ect
just an idea from A CARNY / PROFESIONAL TRAIN HOPPER
im usually in the trains / railroad forum just look for SLIC[8D]
IHC Makes alot of working carnival ride models and a James E Strates Shows Trainset.