First ever RV trip

Is everyone up for the adventure and challenges of 5 newbies in a rental RV?

I have done it and in my opinion, manageable challenges will be:

• Proper clothing and bedding for the 7 days,
• Kitchen equipment, provisions and meal planning for 5x7,
• Balancing drive time, tour time and camp time,
• Having a safe place to stop and camp every night.

Whatever is not in the rental RV that you need, you need to bring in luggage or buy after you get there (Big 5, Walmart, etc.). Consider using checked luggage (collapsible duffel bags) for your bedding and kitchen supplies.  You also have to plan and purchase food when you arrive and along the way (Time and $).

You need to do more planning for each day on the road and know where you will park each night.  Without confirmed reservations, you need a plan B and a plan C.  Looking for a safe place to park an RV after sundown is very stressful.  For example, there may not be an open RV site within 25 miles of the South Rim. Suggest you pick one or two places to stay more than one night to give everyone some time off and balance that drive time.

If you have the resources, rent an RV for a weekend and camp in your driveway or nearby.  Then everyone has an idea of what to expect on a 7 day trip.

I also suggest rethinking Sedona and Flagstaff on this trip due to altitude and weather in March.

Good Luck.

I recommend Hoover Dam and then go south to Lake Havasu and see the London Bridge. 

It's doable but more of a road trip vs get someplace and camp. Plugging into google maps, it's about 800 miles, so figure around 16hr of driving (you go slower in an RV so we usually figure a 50mph average speed). Add a half hour on ether end for set up and tear down. Over 7 days it's doable. 

What will you be using to tour around in? It's a pain to pack up the camper every time you want to go sight seeing or even to the grocery store, plus in many areas parking for a motorhome will be tough. Most owners, tow a car or go very small on the MH...not real practical flying out with larger group.

I would step back and ask what are you trying to see and how much driving do you want to do.

What is your experience driving large vehicles? Nothing horrible on the route but some descent grades. Presumably a rental will be in good operating condition but do a little research on how to drive on steep grades. 

Have a little discussion about bathroom usage with the family. You have limited fresh water storage and more important gray/black water storage...if possible use shower house or other facilities when available. 

Keep in mind most rental units are minimally equipped, so boondocking (camping away from campgrounds with no electricity or water) requires you to be careful with usage. Also, you probably won't have a grill and cooking equipment will be minimal, so how are you feeding everyone...speaking of which, a big chunk of the first day will be lost getting orientated and then hitting a grocery store (assuming you won't be doing all restaurants).

None of this is intended to turn you off to the idea it's just easier when you own the rig and can outfit it the way you want. 

Welcome to the forums!

Not to parrot a famous song, but this could be heaven, or this could be hell. Either way, it'll be an adventure. I cannot claim great expertise either with renting an RV or Arizona at that time of year, but I have done my share of camping and have been in those areas, though not at that time of year. The number one suggestion I'd offer you is to take the adventure slowly, maybe do Sedona and either Flagstaff or the South Rim and leave the other places for another time. The whirlwind tour approach whether by car or RV leaves most of your time in the vehicle driving from one place to another. The great beauty of FV travel lies in being there, rather than getting there. There's enough to do and see in both Sedona and the Grand Canyon to take a week in each. But that's just my humble opinion. Whatever you wind up doing, savor it, make great memories, have fun, and best of luck getting the stars to all align.

The campgrounds is a biggy. The may be hard to find (already booked up) that time of year. You should try to line them up now cause you may have to call around to several to find one with availability. And to do that, you’ll have to finalize your stops and how long you’re staying so you know what days to book where.

So I’m a little fuzzy on your plans. You’re going to drive to one of the stops, do some sighting seeing, and eventually stop for the night where? At a campground? Big box store parking lot? Other? Do you plan on having electricity when you stop? Plug into an outlet? Generator? Other? Planning on having water for showers? etc? Need a dump station to empty tanks? 
Are you going to need heat. Air conditioning? A microwave? Are you cooking meals or eating out? Do you know how big a RV stove is? Does it have an oven?

How many suitcases you planning on taking per person? Is there enough storage? 

Five in a Class C is going to be pretty cozy, but doable for a week. You’ll have about 1 to 1-1/2 days at each stop for sightseeing, eating, showering, etc. Is that enough time for you?

Offhand, I think the learning curve on Rving in a class C has the potential to bite you in the butt big time. You don’t know what you don’t know. You may need to get some experienced person that knows about travel in a Class C to sit down with you for a few hours and put a real plan together. There are some really big potential pot holes in your road.