Daryl can load up to 15 crates * 20kg per crate = <<15*20=300>>300kg.
The nails weigh a total of 4 bags of nails * 5kg per bag of nails = <<4*5=20>>20kg.
The hammers weigh a total of 12 bags of hammers * 5kg per bag of hammers = <<12*5=60>>60kg.
The wooden planks weigh a total of 10 bags of wooden planks * 30kg per bag of wooden planks= <<10*30=300>>300kg.
So in total, Daryl’s items weigh a total of 20kg nails + 60kg hammers + 300kg wooden planks = <<20+60+300=380>>380kg.
He will therefore need to leave out 380kg in items – 300kg weight limit = <<380-300=80>>80kg.
#### 80