RV Manual
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We spend most of our time and miles on the freeway sharing the roadway with vehicles of all descriptions. Maintaining safe legal speeds is most important, and drivers training courses teach that the safest speed on a freeway is the speed of traffic. This causes a dilemma most of the time because most drivers go a little faster than the speed limit on the freeway. On two lane freeways where there are a lot of trucks, and if you choose to drive the strict speed limit, these 80,000 to 120,000 lb. behemoths will be passing you. So you have to decide for yourself if you want to run with the trucks in the right lane or drive a few miles per hour slower and continually get overtaken. Running with the traffic is the safest technique. If you have more power to weight than the trucks, you will normally move to the left lane when ascending a grade and then contend with automobiles that want to go faster. 

Use rear mirrors, so that you always know what's happening around you. This is especially important if there is traffic going slower or faster than you are. Look way down the road so that you can anticipate conditions that will happen in a few seconds. This allow you to be at the right speed or in the lane to avoid dangerous braking maneuvers. 

Getting on and off the freeway so as to merge into and out of traffic causing the least amount of problem is also a challenge because of the limited acceleration of most RV's. If you are in the right lane and see ahead where a truck is attempting to merge, of course move into the next lane to the left if it's safe to do so. If not, give the merging driver a break and adjust your speed to help him get into traffic safely.

As of the use of "Cruise Control", first, if you are using it because you leg or foot is stiff, then you should be taking your "tow hour" break and do more than just moving your foot and leg to relieve stiffness. Second, by using the cruise control to manage you speed, you are not paying attention to one of the most important controls of you rig, and that is highway speed. This inattention lulls you into a state of non-attentiveness that can be dangerous and increases your response time to emergency situation. 

Following distance is important -- one second of following distance for each 10 feet of combined length. Double it for adverse conditions, including night or twilight driving. Thus a tow vehicle and fifth wheel with a combined length of 40 feet would need 4 seconds of following distance during favorable daylight driving conditions, and 8 seconds of following distance during adverse or night conditions.

Safest is the speed of traffic, rather than posted. If traffic is greater than posted, go with the flow. You can avoid this freeway phenomenon by driving the blue lines. Pick time of day if you must go through LAX type places. Don't drive at peak traffic times. Practice high speed lane change, as heavy RV can turn easier than you can stop them.