Another approach
If you have a small iPad or an iPhone here is another idea.
Install a TV on your cart, and get an Apple TV to connect to it or get an Airplay compatible TV. Then you can Airplay your iPhone to it. To do this you will also need an inverter to convert your battery 12vdc to 120vac. But all that together is less than an iPad Air.
I am not sure how large you want, the TV can be as large as you want, whereas the largest iPad is a pro at around 12 inches.
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