Easy_C
Peacock
Also the M777 was designed for light weight use, capable of being airlifted by a CH53, and is a very very capable system provided the crew is trained and knows how to operate them and do very basic preventative maintenance (PMCS) which is not often the case when you give these second hand to recently conscripted forces. These comparisons aren't an accurate problem framing scenario to make comparisons on US equipment used by US forces compared to 3rd or 4th string conscripts being sent to the slaughter by a corrupt regime.
This is another concern. One issue I'm hearing from people like MacGregor is that the Ukranians don't actually have the correct mindset for fires planning; so anything you give them just gets fired off in the general direction of the Russians indiscriminately and they burn through more specialized munitions at an unsustainable pace.