I've tried a few of the containers that spawn roadside.
Red, Blue and Oil barrels and Large Boxes: Looted ten of each ones:
Red Barrels: Sewing Kit and ropes a bit on the high side, average loot with some clothing
Blue Barrels: Sewing kits need to be toned down, overall good for consumables, a bit low for sheet metal. Some semi bodies, smg bodies not shown (one in 20 loots, way too rare)
Large Box: More interesting loot. As they happen once for 3-4 barrels, overall is still balanced. No SMG bodies (too low chance?), a few times cameras or computers (always seen 4 pieces per time). Roadsigns perhaps too high, sheet metal on the low-ish side.
Oil Barrels, side of the road: Overall 257 Crude Oil + 87 Low grade on average per barrel. It's way TOOO much. 10 barrels which are easy to find will yield at the end ~8600 LGF, covering a week worth of consumption in 5 minutes.
Toolboxes: Loot is varied, with a lot of instruments, some clothing, a couple weapons and a few rarer loots like cameras. The loot below was from 6 boxes. As they're rarer than larger boxes, on overall all good.
Final conclusions: a few consumables are a bit on the low side, sewingkits and rope drop way too much and often. Rifle Bodies never dropped in here, only in the small military crates from monuments... which makes worthwile doing an airport run or any other high-loot place. Oil barrels need to be dropped to at least a third or a quarter of what they offer now.
