I don't know the loading rules for Japan. But I think you could fit more on the truck. Many bags are foam and have little weight. Make every trip efficient. The rental and fuel add up.
lots of hard work lads but will worth in end. as for acorn you can make bread with them. and many way eat and use them Acorns can be used in a variety of ways. They can be eaten whole, ground up into acorn meal or flour, or made into mush to have their oil extracted. Once you've safely leached the tannins from your raw acorns, you can roast them for 15 to 20 minutes and sprinkle them with salt for a snack