I used a hitch mounted bike rack with extra support straps to transport my light weight friction drives. When I added the chain drive, almost lost the bikes so I started loading in the truck bed. When I go to the lake, they ride in an enclosed utility trailer which doubles as storage. If a storm comes around, they stay nice and dry.
hey, i got a trunk rack by bell from walmart. it holds both my murray and my 4 stroke schwinn with no problems. 2 rubber hooks go on the lip of the trunk by the back window and the other 2 go on the bottom of the bumper. the trunk flexes with the bikes but after you remove the rack the trunk looks fine, i use a 25 foot length of clothesline rather than the cheap velcrow you get with the rack.