something i did today is along the same lines but a little easier to do if you arent strong enough to hold the dog up.
I still use a bicycle tire. i hold it in the air, once she jumps for it i let go so there is no whiplash or anything. once she comes to the ground (while she is still holding it in her mouth) i pick it up and put my arm through the tire and place it over my shoulder and walk around. Roxy will still hang out but her feet are touching the ground as well. She will pull it in the opposite direction i am walking and jump to get a better grip...etc. seems like a decent alternative. if i come up with anything else i will post.