Prevailing Speed

I've read these replies and find everyone's comments interesting. Since this was asked in an RV forum, I feel the answer has to be answered in the best possible RV response. Some answers came close but not in my opinion well enough. YOUR prevailing speed must be based on your RV components. First go to the tire manufacturer's page and get the tire speed vs. weight load chart. Then look at your RV's laden weight (weighed at a scale not guessed at or assume). Next visualize the road you will be on (road surface, curves vs straight, traffic load, etc.) The higher the laden weight, the lower your speed should compared to the tire charts speed. The worse the road conditions or more traffic, then again lower your speed. On an interstate with my highly loaded RV and moderate traffic, I'll try to maintain 60 mph (5 less than my tires max at the weight I haul). Higher traffic will lower that by 5mph. I want to get where I'm going but wont sacrifice going faster for safety in any situation. Vehicles that come up behind me are never impeded by more than a couple of minutes.