We are doing a lot business with tank trucks (and we are not in IS-OIL business).
I would like to understand your question/requirement but have some difficulties, especially on the point "actual loaded or picked quantities can differ due to heat, temparature, "
Volumes may change based on temperature, but not the weight.
What are the units used in this process, what do you load, and why is there a difference? How do you know about this difference, what do you compare?