Yes, Reithoffer had some unique trailer mounted pieces over the years:
At one point they had 2 or 3 double Hampton sets (possible Gillette may have gotten their from them) and still have one of them on the orange unit.
They also had 3 of the wisdom coasters with another ride on the front of the trailer (Super-Jet, Go-Gator & Caterpillar).
And they did have a nice trailer mounted Venture River. Someone bought it and made a stage out of it years ago.
And let’s not forget Dream Land has 3 or 4 Mangle’s kiddie rides (Fire Truck, Pony Cart, Whip, etc.) that are nicely trailer mounted…
And some mid-west show(s) have trailer mounted rides like the Bear Affair and other such items