Get a pro model and reinforce it. Your decks are probably breaking often because you are grinding concrete/ rough obsticles. Even if you POUR wax onto the ledge, it ruins your deck but scraping the top and the deck gets too thin. If you like grinding alot, get some '' rails '' for skateboards and put it at the bottom of your deck. Powell thin ribs is what I ordered. If you don't want to get those rails , grind on metal stuff only.
My friend told me these and it really helps me continue having my strong scooter.