Engine Stands?

I have a three wheeler. Never had a problem in 18 years with it falling over. The only dicey situations I have experienced are when moving over large gaps between concrete slabs, such as the lip going from a driveway into a garage. At some point all of the weight is supported by the front wheel of the stand and the person on the back while the dual rear wheels are being lifted over the slab. At that point, things are quite unstable.

IMO, if the front wheels of a 4 wheeler aren't spread out as far as the rear wheels, you aren't much better off than my 3 wheeler. That's my 2¢ worth.