His smaller truck is 8000*.3=<<8000*.3=2400>>2400 gallons smaller
So it can transport 8000-2400=<<8000-2400=5600>>5600 gallons
There are 6-2-1=<<6-2-1=3>>3 of the very large trucks
Those trucks are each 8000*.5=<<8000*.5=4000>>4000 gallons larger
So they can transport 8000+4000=<<8000+4000=12000>>12000 gallons
So in total they transport 3*12000=<<3*12000=36000>>36000
The 8000-gallon trucks can transport 8000*2=<<8000*2=16000>>16000 gallons
So in total he can transport 5600+16000+36000=<<5600+16000+36000=57600>>57600 gallons
#### 57600