Suspension Related Problems of the 2018 Ford E-350

Suspension problem

This vehicle has a 12,500 gvwr. We recently had this at a Ford dealer for a broken left rear suspension. The dealer weighed the entire vehicle and determined the tare weight to be 11,200 lbs. This is a class-c motorhome and it was completely empty of any and all cargo, no liquids, which is capable of carrying 40 gallons of water at 8. 3 gallons per pound. There was less than 1/4 of a tank of fuel, of a 55 gallon tank and the manufacturer states that this is a 4 passenger vehicle. With the math we have done, of 40 gallons of water at 333. 60 lbs and 55 gallons of gas equates to 346. 50 lbs. My 4 members of my family combined weigh in at 800 lbs and with all the totals added together I come up with 12, 680 gvwr. This vehicle has a rated by the manufacturer tow capacity of 8,000 lbs. The vehicle has many large storage bins incorporated into the unit. Based on the weights displayed, I've already exceeded the gvwr. With that said, I can not legally drive this vehicle with the 4 members of my family. My storage compartments are completely empty and I have no camping supplies onboard, that including pots, pans, cups, toitletries, chairs, etc. The reason for this notice is because the left rear suspension has failed in only 7,000 miles traveled. I'm fearful that if I drive this and have any situation on the road, that my insurance company will invalidate my policy.