When we went to Nashville we rented a special van that had a wheel chair lift so that Grandpa could get out (Grandpa picked up the bill on this). He requested a couple stops including the graveyard where his parents and son were buried. We had a nurse come with us as well just in case and while we did not have any medical issues, Grandpa did slip out of the chair as Grandpa was secured in the van and the chair was secured in the van, but Grandpa was not secured in the wheel chair and he slowly slid downward.
We try to get Grandpa out each time we visit. He is very fun to be with and tells us stories of the places we take him. Since he has lived in Nashville his entire life, as did his family as far back as we can trace, he knows more than most about the city we are visiting.
Anyhow the road trip was our gift for Grandpa, we sure hope he enjoyed it.