I know of several drivers years ago,that recieved carrer ending injuries unloading the old drop frame trailers.However they were very good to pull down the highway.They were heavy,with a low center of gravity,which seemed to make them trail real well in double and triple combinations,especialy in the wind.The hydrolic landing gears could be a pain in the rear,when they got bent,or low in fluid.When I firat started driving,they trained us how to jack up the tracter to install tire chains with the hydrolic landing gear.They forgot to mention that you had to be parked on level ground.Some drivers would get stuck on a hill,jack up the tracter with the hydrolic langing gears,then after chaing up,the landing gears would bind,leaving the rear of tracter hanging.The driver would have to call a wrecker to get the tracter on the ground.Made some major embarasing memories for several drivers.