Here's something to chew on:

An obvious concern with adding a joint is that the force in a rollover will collapse that weak spot. Myu questions are: Will moviing it as near as possible to the rear hoop help alleviate this stress? (top picture) Why do the cage kits seem to have the joints right in the middle? Also will a tube connector like i drew, ran with grade 8 hardware, provide a stronger joint since its creating a shear load instead of a sleeve which is susceptible to bending just like the tube?