For 600 a week, there is no way that you will be able to make a living,
lets say you do 4 runs a week, his straight truck will probably get only 8-10 miles per gallon, at an average price of 260 per gallon, and your truck will take approx 100-150 depending on the fuel tanks, so figure 2 75 gal tanks, and you fill up every other load, your talking 400 in fuel only in one week, plus what insurance, if its Occupational that he or you can pay for, but if its truck liability NO WAY that is his responsibility not yours.
You should be getting 60% if you paying for fuel and insurance, of the load of what he gets not a flat amount, this owner is out to screw you one way or another. Lets give you an example,
Average Rate for a Straight truck is $1.07 per mile loaded depending on company it was at one time 62% of that to the owner, Thats $.66 cents per mile to the truck, then you get 60% of that is roughly .40 cents a mile to you.
You get a 500 mile run, x. 66 to the owner = $ 528.00
Your Share is 60% of that $ 316.80 on 1 load, minus fuel
Lets say you get 3 runs like that, that $ 950. in your pocket for the week, minus fuel tolls, and your occupational insurance. which is a lot better than $600 """"Right"""". At that rate 600 per week ain';t worth the paper its written on, he wants to make the money and you will go bankrupt in no time, supporting his profit, AINT NO WAY I WOULD TAKE IT.