bed and is driven in proper direction to move the load onto the driven roller bed 14 which then moves the containers into transport position the stops 40 and 42 are raised to lock the load in transport position and the transporter 12 is then backed away from the roller bed and is driven to a second location where the short load is discharged from the transporter 12 the short load is preferably discharged onto another interconnected roller bed after first lowering the front stop 40 said other roller bed may be power driven or if not power driven it is driven by the retractable friction drive 36 in cooperation with the transporters driven roller bed 14 to discharge the short load from the transporter 12 if a long load of one or more containers i e a load longer than the transporters driven roller bed 14 is to be handled then the dolly 13 and the transporter are moved together and the pin 84 is dropped into coupling position with the ears 86 80 and tongue 90 the free roller bed 70 of the dolly 13 thus defines an extension of the transporter 39 s driven bed 14 with the transverse rollers of both beds remaining parallel to each other while connected the loading and unloading of the long load is the same as above described in regard to the short load however if more than one container makes up the long load the rearmost container must be long enough to be partially supported.