Is 14 passangers a safe load in a motor home?
Well, that depends on several things but the basic answer is "Not usually" (There are exceptions)
First: as someone up-thread said in any moving vehicle save a bus (they are specially designed) and I'm not 100% sure about buses the number of passangers should NEVER exceed the number of seat belts. Same as on an airplane. How many Mother homes have 14 or more seat belts?
Second, if you are talking 50 pound kits that's 700 pounds. I carry 640 pounds of fresh water. So weight wise, if my water tank were empty,, Might be ok.. But if you are talking bigger people Well... I can carry up to 720 pounds of waste water (never do but I could) so now we are up to 100 pounds average. But as you can see that is a lot of weight.
The best thing you can do is to watch the Mitchlin Video (Which I think you can link to from www.rvsafety.com ) showing how to react when a tire blows. I learned when I watched. Thankfully I have never had to USE that knowledge, but I still learned.
Now, when would 14 be safe.. Short low speed trip. Little chance of disaster, never over 25 mph.
I once had 13 people in a Dodge Maxi Van (one very happy young lady had one of my passaangers sitting on her lap as I recall.. His pen name is S.P.Somtow we were returning to a convention after watching a movie in which he wrote, directed. helped product and starred).
I do hang out with strange people.