So just making up an example, If you use the Pendleton OR mileage rate of $1.22, pick up a MH and go 700 miles, that would be $854. If, and it's a big IF, they let you put a small toad behind it for the return trip getting 30MPG it would take 24 gal of gas at $4 then the return trip would cost $96 leaving you $758 for four days of work - return time included. Yes, I'm just talking in very general terms, no expenses for tires, oil, wear and tear, etc.
The reason I said IF they allow you to attach a toad is I sometimes see transporter driving a new MH with TT behind it, both going to the same end selling dealer. Then I guess you return expenses are flying or a bus.
It would be nice if someone who's actually done it happens to chime in.
Bill