@traderfjp i have towed Coast to coast. You are definitly stressing too much over it, but that is a good think. If I were you I would make the trip myself. 600 miles is a 2 Day trip with lots of time to spare. you leave on Friday morning, check in a hotel and Saturday day show up at the dealership at 8 am. By 10 am you are driving and by midnight you are home with 60 to 65mph tow which is a rather safe paste.
as long as you tires are properly inflated, you have some ( not full just some grease), and you use front and rear straps you should be fine. The 190s are really easy to tow.
i will be glad to answer any questions but $1,800 for 600 miles in on the high side. I would say $1.5 per mile is on the average ballpark. If you make the trip yourself you should get away with $0.75 or so.
aside from the fact that COVID is everywhere, I do not see why you should not take the trip yourself.