Not sure what your supplement says about how to use helpers, but in the Atlantic supplement the contract states: "the helper must deliver or pickup packages only in conjunction with the driver they are assigned to while on duty."
The use of a TP 60 or golf cart is not contractually in "conjunction" with the driver. At least here those things should not be allowed.
In the scope of the contract you write about, "conjunction with the driver shall mean ___"
A.) something. Please tell me what that something is.
B.) There is nothing here. How it's construed by different groups will lead to a conflict.
Since you didn't define it, let's look at B.
Even though thesaurus suggests conjunction, cooperation, collaboration and collusion are synonyms, they're not exactly the same. i.e. if gas station owners are talking to each other to share details about fill-and-runners, they're cooperating. If we say they're in collusion, we tend to think they're price fixing.
If the contract defined the application of the word specifically, it's unnecessary to debate over the different interpretation of the word. If one writes a sloppy contract, they can expect to have something coming at them. The definition can even be in the foot note, so the body doesn't look like a wordy fuster cluck.
Even though I've been a research assistant, most of time wasn't spent together with the researcher. Yet, I worked in conjunction with the researcher. Passersby won't know that unless they ask and that doesn't mean we weren't working in conjunction. Of course, if I make a mistake and the driver/researcher is questioned for misdelivery/plagiarism, its highly likely that they'll say "the helper.../the assistant... probably did that" but when what I do earns them a recognition, they typically don't hesitate to grab 95% of the credit even if I did 70% of the work.
