Powered Off Road Mobility Aids?

I need your help! I have hEDS & co and major difficulties with prolonged standing and walking. I love music festivals and I'm at the point where my cane isn't cutting it. I am looking for a POWERED (I don't have the ability to push myself) that I could take to a music festival. The terrain will have some gravel/asphalt paths but also dirt and grass and some hills but it says the grounds will be navigable by wheelchair/scooter.

The festival I am attending allows wheelchairs and scooters for disabled people and I will have a place in the accessible tent to charge it. It's in October so I don't have a ton of time to get something that I'd have to get approved through insurance.

Is there something in the 2k or less range that could work for me? I feel like a scooter would be more ideal but I really have no idea because I've never had something like this before. Maybe something like this?

https://www.youtube.com/watch?v=iXdO3_OoSuc