thatbradguy said:
You have all been super helpful. I am forwarding this thread to my wife and we're gonna talk through it... and likely make some adjustments. I'll keep you posted!
Brad, you are wise to have come to this forum in the first place and listen to what experienced travelers have to say about your idea. You are even wiser to realize your initial idea may not have been doable.
If you have never driven a motorhome before, you'll find it a completely different experience than driving a car the same distance. My wife loves the idea of being able to get out of her seat and go to the bathroom or get a soda out of the fridge while I'm still driving and not slow us down. But we still will stop every 90-120 minutes for several reasons. One is bathroom breaks for both ourselves and our dogs, another is to stretch your legs and walk around so you don't get a DVT, something that can happen at any age if you sit too long, and another is simply to give me a break from the road. If you're going to rent a Class C motorhome, it will drive and ride more like a van and be slightly easier to control than a Class A, but you will still get fatigued faster than you may think. I drive a Class A with toad. I assume my next trip will be easier because I am going from using a tow dolly to flat towing. Are you planning on towing a car behind you so you can visit the parks that don't allow motorhomes on their roads? If so, that will slow you down even more.
And your breaks will always be longer than you will plan. I assume when planning a trip that we will take a break every 100 miles or so and I used to give us 15 minutes until I realized after several trips that this was impossible. The dogs being walked will take 10 minutes or more, then we have to use the bathroom, get a fresh drink and/or snack and get settled back in our seats. That 15 minute break always winds up being 20 or 30. I used to plan 30 minutes for lunch until I realized we simply needed to stay off the road for longer than that and unwind a little, so now I give us an hour. When you throw in 3 short breaks and an hour lunch, you're off the road for a total of more than two hours that has to be added to your driving time. When you figure that you're going to have an average speed of around 50 mph, an eight hour day will give you six hours of actual driving, which means you're going to travel about 300 miles per day.
I don't travel with kids, just dogs, so I have to assume kids will slow you down even more. So that 300 miles might wind up taking you 9 or 10 hours per day. If you were to try to stick to your original thoughts of driving 500-600 miles per day, you will now realize doing so would take 15 hours or more each day. Trust me, you don't want to stay on the road for that long more than one day. By the third day, you'll be regretting going on the trip at all.
You didn't mention where home is for you, but you are 1,000 miles away from the GC and 1,200 miles away from Yosemite, so I assume you're east of those destinations. You may want to think about modifying your itinerary to include only a few of the sights you mentioned if you are going to be limited to 21 days. And give yourself a day or two off the road before returning to work or else you'll need a vacation from your vacation. As someone else already suggested, break this trip into more than one so you can enjoy what you are visiting more and for a longer time.
I had planned out a 120 day trip that would circle the western half of the country, starting in SW Florida and seeing as many national parks as possible from Rushmore to Olympia to Yosemite. I realized I would be able to see everything I wanted, but wouldn't really enjoy it. So I broke that trip into two, with the first one covering Rushmore, Tetons, Yellowstone, Glacier, Banff and Jasper; essentially the north half of the journey that will be taken next summer and will take 86 days. The second half will be the southern half of that circle, allowing us to see the GC, Vegas, Death Valley, Yosemite, Sequoia, Kings Canyon, Redwoods, Crater Lake, Mt. Ranier, Olympia and then circle back through Colorado and see the RMNP. That trip will be over 10,000 miles long and take about the same amount of time the original circle was going to take - about 120 days. This is the only way to visit the parks and really take the time to enjoy what you're seeing, and still feel like you took a vacation when you get back rather than it being a chore from which you need rest.
Good luck with whatever you decide to do.