A hitch and hop wrote:
I usually am driving between 60 and 65 and find that on the Interstates, I am not a problem when there is light traffic and find that I am keeping up with the traffic when it gets heavy. I do make it a practice to flash by lights to the truckers ( and other RVers) when it is clear to cut back into the lane I am driving. I most often will get a thank you return flash from the truckers as it lets them know that they can come back into the right lane safely.
BRAVO, to you, AH&H, for continuing this practice! It has it's origins in the 2-lane roads of times gone by and a 2nd BRAVO to the truckers/RVers who know what it means to give a "Thank You" flash of the marker lights!
As to your situation, P3TC, at 76, your reflexes have probably slowed at bit and a 60-65 MPH range is a good one for you. Keep in mind, however, the
minimum speed on most Interstates is 40. You are well above that speed as your comfort zone. Taking into consideration the total distance of your trip, a lion's share of I-driving might be more beneficial. Once you get out west, you can pick the brains of fellow travelers (preferably those with rigs the same size as yours) as to which of the backroads are safer and passable for your size rig as switchbacks can be a bear if you have to back up to make one without snagging the fender of a passing car with your back bumper... or your toad. The Interstates in the Midwest are, for the most part, flatter, smoother and less curvy than in more mountainous areas, ergo, you can put some miles behind you on those thoroughfares! Also: Interstate Standards for vertical clearance is 16 feet in rural areas and 14 feet in urban areas... There are exceptions to this, of course, but compared to U.S. routes, you can find yourself in a really sticky wicket if you haven't scoped out your route(s) on a U.S. Highway in advance or sought the advice of the area natives.
But: The Bottom Line of all of this is to do what YOU are comfortable with. This RVing Stuff is
supposed to be FUN, right?! If it isn't, perhaps it might be time for some re-evaluation and re-adjustment of what you're willing and able to perform.