The only problem we've encountered with the west coast dollies/converters are the ones with the fifth wheel handle on the passenger side...the handle tends to seize up making them almost impossible for one man to drop out. Usually someone has to rock the truck/dolly back and fourth while a mechanic is spraying a lubricant and pulling on the fifth wheel handle with a dock plate handle just to get it to release.
The ones with the fifth wheel handle on the drivers side are just as good as the Walbash dollies.
And yes, you'd better eat your Wheaties if you plan on using one of those Great Dane dollies!