What I mean by electronic deposit is to take pictures with your smartphone of the check and deposit it that way. Not all banks have this, but I would guess all major banks do.
You need to have a bunch of blank comcheks with you (can get them from Landstar supplies) and then call comdata, the number on the back of the card. You will then register a check by entering the check number, amount, etc... it is all automated, you dont speak to anybody.
Then fill out the check and call the number on the front of the check (where it says 'dont cash before calling...'). You will get a confirmation number that you write on the check. If you dont do this, the check will not go through. If you take the check into a bank, they will call and get the confirmation number, but for atm deposits or smart phone deposits you have to do it.
It is much easier than it sounds.