Okay - Your problem appears to be that you haven't actually got a table where all this information is pulled into - a transaction or any form of joining table.
You haven't defined what you are trying to actually achieve.
We know what you are trying to do with the table relationships, but you haven't actually told us what the purpose of the database is - In plain simple English.
Alright;
I want to be able to use the search combo boxes with the tables instead of creating another filter for the Navigation Form to work.
I also need the subform to let me add Multiple trucks for each company since its a One to Many relationship.
Does that work?