Description:
Adds a "Capacity" configuration row to every vehicle that carries something worth carrying. Pick it when you buy the machine, or change it later in the workshop. No duplicate machines in the shop, and it works on mod vehicles too.

Features:
- Seven levels: Stock / +25% / +50% / +100% / +150% / +200% / +500%.
- Each level costs a share of the vehicle's own price, so taking it to the top adds only 4% of the sticker price.
- Only the capacity that matters is changed (crop tanks, seed hoppers, sprayer and slurry tanks, mixer drums and auger wagons).
- Diesel, DEF and air tanks are never touched; tractors and balers have no row at all.
- The load's weight grows exactly as it always did up to the original capacity, then stops, ensuring upgraded vehicles stay driveable.
- Applies to goods bought full: seed, fertiliser, lime and animal feed big bags, liquid fertiliser and herbicide IBCs, mineral feed, silage additive, liquid seed treatment, and seed potato, sugar cane, poplar, tree sapling and rice sapling pallets.
- Because this is a real configuration, the shop and workshop prices, the savegame and multiplayer sync are all handled by the game itself.

Credits:
FastFarm Dad