Level 1 and 2 charging are something of an equivalent to siphoning gas, and maybe too easily overlooked. Carry a wall plug and dryer plug adapter and you can plug in just about anywhere. RV plug in the camping area of a national park. Utility plug on the back of a work shed in the middle of nowhere.
Won't charge you fast, sure, but can be the difference to charge you enough to make it to the next stop, in some cases.
Yeah, I meant siphon gas truck-to-truck, but it seems most worksites would be wired or have generation of some sort, so mobile charger should be able to do something in a pinch. I have had situations where a normal 1400W wasn’t enough to keep pace with keeping the battery warm enough to make any headway on an actual charge, though, but that remote AND cold is a another level.
V2V (vehicle to vehicle) charging is a standard option supported by CCS and NACS. So far implementations are limited, with most of the current focus on V2H (vehicle to home) or maybe V2G (vehicle to grid). The Ford F-150 Lightning supports V2H but not V2V today. (Interestingly, the Tesla Cybertruck does support V2V.)
Won't charge you fast, sure, but can be the difference to charge you enough to make it to the next stop, in some cases.