I for one think that flashing a trucker or fellow RV'er when you feel it is safe for the guy to pull back over is a good thing. I've had many a rv pull over when they thought it was safe but it scared me, and one or two times I had to apply brakes so their toad would not take out my left front corner. I don't count the number of people who respond with a thank you flash.
Keeping up with the flow of traffic in an RV can be really bad advice. Going around Atlanta at the going rate is scary and exceeds the speed rating on most tires. Traffic jams are not caused by people driving slow in the right hand lane. If people would get out of the left lanes (s) it would be a great help.