I'd say just add the tip up to the stock extension. You'll probably be able to hold just as much compared to taking the stock one off and putting a different one on. There was a bin extension question in the Case section. As I said in that one check with Harv's Farm Supply, they build the Bish Bin extension. Not sure how they compare to others as far as added capacity but they look like they may hold a little more, and they're probably no taller than any others.