Actually driving with your flashers on is illegal in many states no matter how fast you are going. Not saying not to do it, just pointing it out. Just the first sight I went to. I knew about CA, not the rest.https://driversprep.com/when-should-you-use-emergency-flashers/
eagle19952 - What's the upper speed you can maintain with your 740 in 2nd gear? In our 4108 with the 4-speed, 2nd maxes out at about 30 mph.
When using engine to assist holding coach back,, watch rpm's that they don't exceed governed speed.