Anyone who acts all smug about something like that should be immediately disregarded as too stupid to understand which end the of the gun goes bang.
That is NOT easily accomplished with the ordnance consumption of a modern military. Then, since you aren't driving 90mph down the autobahn to take the ammo in, that's 60-70km+ of vulnerability added when you try to ship out the ammo. More distance to attract drones, enemy infantry fire, or just good old fashioned CAS or artillery. That's without factoring in the time problem. From the looks of those videos, anything over 30mph is going to be RISKY when transporting ammo, and that's before you get into the shit condition all the Russian ordnance appears to be in. (For fuck's sake, at least brillo pad the rust and corrossion off the fucking rotation band on your artillery shells, you fucking mongs)
Plus, that completely ignores that the 60-70km is in the range of that HIMARS. Meaning that sure, the ammo supply point is out of range, but as soon as a vehicle leaves the depot and is spotted, the HIMARS guys start furiously masturbating with their hand over a big red "FUCK THEIR SHIT UP!" button.