I know people have used Drive continuously that haven't experienced any negative sides. My only word of caution is regarding tolerance; if you notice the benefits starting to drop consider taking a1-2 weeks off. Otherwise there is no problem being on it continuously, especially since the effects take time to build up.
As for stacking suggesting, I'm not the biggest fan of tribulus. It may raise your libido, but not you T levels. You can stack it with other test boosters out there, but just check their icariin content so that you don't mistakenly doubledose on the same component.