Hi @Josh_Clark,
Please show us your table setup so we can help you.
A multi select field cannot be linked, if that is your question.
Usually what I do in such case I creat a table with the trucks and i link a field to that table, you can then choose from the options in the trucks table. In this same table, if you want to populate several other fields with data from the 2nd table, you can use the lookup option.
BR,
Mo