those are betas stright from mywork folder
flat bed 2 axle ! is more developed and has beams tuned, you can delate flat bed 2 axle.
flat bed 3 axle beta has moved hookgroup to better stabilize palets that seat on top of outher pallets. Heven't decide wich one is better now has not realy time to test it.
gpower generators are diferent stage of developnemt 3 is one most developed you can delate others