I think those tires are XZL 395 -85R -20's , although they could be 24R21's..... Although I don't think so.
The 395's are what are used on MRAP military trucks....and Unimogs, but these might be a Special Dakar version. All commercially available versions of
The XZL have a top speed rating of 55 MPH, And I don't think Michelin would feel good about a bunch of heavy trucks in rough terrain going twice the rated Speed.
Edit : I think those have to be larger than the 395's, and on 24" rims...not 20's.
They are just too big , compared to mine.
These tires with rims are 300 lbs a piece, give or take a few pounds, and getting them up onto the lugs Is a major victory. Jib arms with electric winches to get them on and off the spare rack is the norm.
On my Unimog ( new one, the green one is sold) I run 425 /75r /20 XM 47's, which are a chevron tread AG Tire. They are lighter and more flexible than the XZL's, and not as tall by almost 3".... They weigh 288 Lbs per corner. Changing all 4 of them, in a parking lot by myself with an air gun, and a pallet jack was a royal pain. It drove home the point of what kind of effort would be needed to change A flat out in the rocks or the sand . I have been lucky to Not have had to do that yet.
From what I know , you are not supposed to stack air pillow jacks, and you are supposed to back them up with a jack stand.
Weight ? The current Unimog weighs 13,700 Lbs (semi-empty). The race trucks are probably within 1500 lbs of that, up or down. Hopefully Down.