I agree with others, it depends on why you are re-taking it. If it's just that you took it awhile ago and you are refreshing, summer should be fine. If you are retaking it because you struggled with it before, I would recommend taking it during a full semester. You mentioned the drive to class in the summer. That takes time out of your week as well. I took 5-hour chemistry and A&P 1 last semester together and got A's in both. I have a job & kids so it was hectic and time-consuming, but doable.
Since you already have materials from taking A&P previously, I would recommend spending time every week between now & when you re-take it (schedule time on your calendar for it) studying the terms and concepts so that you're set to go when class starts. Most teachers have office hours and love to help you if you need extra help...and definitely go to open lab times -- you will have access to all the models and a teacher there to help if you have questions. If you can, go to the open lab time that your specific teacher hosts so that he/she can see that you're putting in the effort. Best of luck to you!!