Proud Owner of a 2014 RP178

Bob, mine was a 21 foot, 1991 V6 with 150 of the laziest horses in America! I loved the coach, but the chassis left EVERYTHING to be desired, including the tiny fuel tank. Considered transplanting a 5.0 liter Ford into it, but it still wouldn't be able to tow the Subaru Brat I bought expressly for that purpose, no rear frame to attach a class III hitch. Next time I bought one with a 30' Ford chassis and a 460 cu. in. V8, and towed a Jeep TJ behind it. Never saw a hill I couldn't zip right up, or a gas station I could pass, 6 mpg. But the real problem was the $1000 repairs every time we took it out, gen set, refrigerator, A/C, and on and on. Kept the TJ, sold the coach.

Now I like EVERYTHING about my 'pod, including the tow vehicle, less is more.

During my "working years" I drove quite a few miles, mostly where the speed limit was 55 to 65 mph. There are lots of major accidents even at those speeds.

My most "harrowing" RV ride was through Texas (speed limit 80 mph) in a Toyota motorhome with a top speed of 60. It was very hard to merge left for construction or emergency vehicles, and on a hill...forget it.

IMHO it's the speed "differential" between you and the closest object to you and not the actual speed that is most dangerous. For instance, if you are traveling 30 mph and the traffic is traveling 15, it's a dangerous situation that you have created. If you are doing 75 and the traffic is traveling the same speed, it is safer". All this is assuming your TV is properly sized and equipped.

The safest speed is the one where you feel the most comfortable driving.

Speed -  faster vs slower - Interesting discussion about speed and wind resistance, wear and tear on vehicle and tires here on:  http://www.cartalk.com/blogs/tom-ray/will-vs-wife-engine-wear-and-tear

I flew mine home on the ground from Blue Dog/CourDeLane at above 75 mph (F250 superduty v-10) to beat a big snow storm.  Twice we about bounced the little pod off a couple rough Montana overpass crossings due to stiff suspension of both the single axle pod and pickup, other than that she towed like she wasn't even back there.  12 mpg but no slowing down even for the steepest long hills.  I think prudence would dictate slowing down a bit future wise, even with a pickup designed to pull big heavy loads.
Jason--watch for my rpod in Meridian/Mountain home afb in Sept. and welcome.  This is a pretty darn good forum to be on.    

I saw no adverse effects, I have my TV fully equipped with Sway, cooler etc. My temps and RPM were low. If you drive less than 75 on the Idaho hwys, the semis will take you out lol.