Is this a reasonable cost per mile?

Do you own the trailer or rent it?
Maintenance/replacement sounds pretty close. About $30k/yr on avg. Tolls should pass through 1:1 or better on load pay, so no worries on that unless you take toll roads when you could avoid them.
The pay is problematic at $1. I'd pay whatever the comparable company would pay and save the rest in the business account for equipment upgrades and taxes. You'll be buying another truck pretty soon with those miles. It's no spring chicken.
Also, budget for health insurance premiums you have to pay yourself. Try to run 100k miles a year to dilute the fixed costs more.
Once you have 5 yrs to look back at, you can smooth out the annual volatility and base it on a 5yr average. Keep a $50k emergency reserve in the business account. Fine tune your spreadsheet as needed.

 

Sounds good. Just don't do the inframe unless absolutely necessary. Might be better to buy another low mileage used truck. You'll get caught chasing and replacing everything else too after the inframe. Or the knuckleheads will screw up the inframe. It happens a lot.

 

I suggest putting 4-5% in the maintenance escrow, it is pulled from LH only. I use it for tires though LCAPP, and pull out of it to pay physical damage insurance, and clear annual base plates. Also clear ‘red file’ if you take a month or two off.

They pay quarterly interest on it and it’s transferred at your will to either fuel or settlement card.

 

My 97 kw was running me 52.2 cents a mile, I averaged 35-40k into it every year, you probably have another year or two left before costs really start to swing the other way so I would start budgeting a bit more,

over is always better then under