I have one, it works well. I think you can gett all you need and much more. You may need to update your iPad OS ...check that out at the
BlueFire website. I have used my BlueFire adapter on my bus and my dad's RV which has the same drivetran as you have in your bus.
Note: You can download the FREE app from links on the BlueFire website and try it out in demo mode to see that your iPad works with it. The same app works with the adapter, so it is a full function app.
Second note: When you are ready to purchase, order it from the BlueFire website and enter AMAZON for the discount code and you get 10% off of the Amazon price!