A Technic set from ~1997 with a long grey batter box
Looking at that part and doing a little digging, could this be the set you were thinking of. it is not a Technic set as such, it is a much older set but it seems to be the only one with a tanker and that wheel in.

Basic Building Set
Item No: 740-1
Year: 1985

https://www.bricklink.com/v2/catalog/catalogitem.page?S=740-1#T=I