Hey guys so am looking at the lectric xp 2.0 and the radrunnner mainly the only reason am looking at the radrunner is cuz the rack seems robust, i want to carry my 42 pound child id the lectric rack strong enough for this??? Thanx
Rack would likely carry the weight, but it's the speed & acceleration that will make the rack fail.
Operate the bike (plus child) within its limits, it should be fine.