Certainly the thing to use in the near future would be starlink. 50-150 mbps and <100ms ping. Right now they're only advertising their service for fixed locations, but if you park the van in one place for a while it might work out just fine.
We use Viasat at our farm and it's acceptable but kind of slow and has a long ping. I'm really itching to get starlink which they've projected will be available at our place later this year.
Yep it's possible. We have two connections - viasat and a fixed hilltop wireless and I can't remember which one was active when I last had a video call, but my partner has video calls daily and I know he's done it when that connection was active. But I can't recall how pleasant it is.
We use Viasat at our farm and it's acceptable but kind of slow and has a long ping. I'm really itching to get starlink which they've projected will be available at our place later this year.