FWIW...this subject was covered a few years ago...a simple to use math formula was given to determine weights of a hydraulic lift plus the bike...I used it and found the following:
The lift + the bike (raised 3 feet) would load my rear axle to within 300 pounds of "max". Not too bad. HOWEVER, it would take 700 pounds off the front end. Not good. Bottom line...for a gasser (like mine) no good. These hydraulic lifts would be fine for a DP tho....
I copied the formula and stashed it after I used it...now I can't find it to give to you.
There are quite a few "dolly type" motorcycle carrier/tow car 4 flat items out there. Time to use Google.
g'luck!