I've done it, and you may need new shocks because they will have to be shorter. You will also loose some travel because of that, more so if its not lifted very much because the shock will get pretty short
You could relocate both and keep the shock you have, or even run a long shock...Not sure on that one. I was going to box a section of the frame where the rear shock mount is, and use a F-250 front mount, and raise the lower mounts.
I was going to go this route because I've considered adding the under floor storage.....Otherwise I would just add a crossmember all the way across, and then tabs to it as well.