Others will undoubtedly have valuable input on shoulder holsters, and I will defer to their experience on that question. You should also do a search for "Shoulder" - it's a button in the bar at the top of the page. To get you started, here's a recent thread on
Shoulder Rigs.
I'm huge, so I can relate. What are you trying to carry? (Snubbie, 1911, single-stack 9mm, etc.?)
If you're trying to carry a revolver with a bobbed hammer (or something else which has fewer or no pokey-bits at the back), check out my
do-it-yourself SmartCarry (appendix position - would be less likely to hit your console), or another recent thread,
Smart Carry for Big Guys.