I have an iPad Pro 10.5 and my 2A powerbank chargers at best hold the current level of charge while I am using the IPad. I am looking for something with a 3A or more output on a single port to hopefully charge the iPad while I am using it.
Actually, that might not work.This looks like it would do it:
https://www.amazon.com/Anker-13000mAh-Capacity-Portable-Technology/dp/B00O1U89TE
Anker is a good vendor - I have a number of their products.
Higher current is not going to help you. What you want is higher voltage, which means you need to invest in a USB-C PD power bank and USB-C to Lightning power cable. That will get you 15V/2A charging, or 30W, much higher than the 2A/5V or 10W you are probably getting now (3 times faster).
I have an iPad Pro 10.5 and my 2A powerbank chargers at best hold the current level of charge while I am using the IPad. I am looking for something with a 3A or more output on a single port to hopefully charge the iPad while I am using it.