I would think you will be OK as long as you have a good wheel with plenty of spokes and you and your ladies are not clydes. Just look at the stuff BMXers do with pegs. These days BMXers probably have oversize axles to prevent bending (I could be wrong)...but in the old school days when I was BMXing the axles were the standard size and I never bent an axle with pegs doing tricks or by hauling extra people around.