Manfrotto 181 Folding Auto Dolly

I have the Ruggard 2035 bag that is larger than the 27" model (2027) and the diameter is not large enough to fit the wheels unless you want to unscrew one or two of the wheels to turn them sideways).

The Manfrotto 475B is compatible once you retract the rubber feet to expose the spike for this dolly to lock onto, correct?

Yes, the Manfrotto 181 Folding Auto Dolly is compatible with the spiked feet on the Sachtler Flowtech 75 MS Carbon Fiber Tripod.

The 57B is the older BOGEN 3156 dolly. It is compatible with dozens, maybe hundreds of different tripods like this one:The Manfrotto 504HD Head w/546B 2-Stage Aluminum Tripod System combines the innovative and stylish 504HD Fluid Video Head with the 2-stage aluminum 546B Pro Video Tripod--creating an ideal combo of affordability, stability, and smooth, precise control. This compact, versatile system was designed with independent video and DSLR shooters in mind, and provides the level of ergonomics and support required by today's small crews and one-man bands. B&H # MA504HD546BK. http://bhpho.to/1wLmLZE

The only difference between the Manfrotto 181 Folding Auto Dolly and the Manfrotto 181B Folding Auto Dolly is that the color is black on the Manfrotto 181B Folding Auto Dolly.

Yes, the Manfrotto 181B Auto-Dolly is compatible with the Manfrotto 161MK2B Tripod legs.

When matching a tripod to a dolly particular care must be taken regarding the interface of the tripod feet and the receptacle on the dolly. In this case, the tripod feet are shaped as hemisphere's. Unfortunately,the Manfrotto 181B cannot accept a hemisphere for it is designed to accept a U shaped dual point foot. We would suggest the following dolly: VariZoom VZ-D50 Light Duty Dolly for Small Jibs B&H # VAVZD50

The operational footprint of the Manfrotto 181B Folding Auto Dolly (Black) is 50 in/127 cm, and its weight capacity is 55 lb/25 kg, which is considerably lower than that of the iFootage Wild Bull T Series T7 Carbon Fiber Tripod, as it can handle 88 lb. If the iFootage Wild Bull T Series T7 Carbon Fiber Tripod's footprint can adapt to the Manfrotto 181B Folding Auto Dolly (Black) and if you are careful in keeping the load capacity in check, then there should be no issues.