You'll be open drive from trans to rear but I wouldn't use one long drive shaft. A friend of mind did that to his 3/4 ton and the new long drive shaft failed and his truck was totaled. I'd go to your local drive line shop, they will not have a problem making a short drive line to a carrier bearing then the long section. And I believe OldSub is correct, in that the T-5 may not be what you want for GIANT loads but could be fine if not overloaded.
