ok theorys we have are
truck ships cargo to the SS Anne
theres mew under there
secret burger king hidden behind truck
easter egg
Opinion:
So heres my opinion on this subject the thing is that the three things that make the most since is the cargo for the SS Anne, then easter egg and finally a event that was taking out. So why is it so tempting well lets look back at man's imagination, hat they do not know they ponder and come up with what seems logical and then when logic fails they think of something thats so irrelivent that to a person who is bound by logic would go crazy.
Lest just think about it what if it wasnt here what if it was never accidently or intentionally put there,what would we be talking about if it had never exsisted. its there for anyone to ponder what was it for and what could have been the reason for it being put there.for me i think the cargo shipping is the best choice,but thats just my opinion and this is true to anyone the truck there is there for you to ponder that sole fact.
and so i conclude on what my opinion on the myesterious long life and longed discussion of the truck in pokemon R/B/Y and FR/LG beside the S.S. Anne.