If you are talking exceeding the manufacturers specs I'm not sure you'll get much info. It's not just the suspension, tires, etc., its the dynamics of to much weight or if the garage can handle it. I think the payload capacity is usually around 2500# and that number will include your garage weight. That is a big limiting factor.
Most toy hauler trailer style garages can handle 2000#, but sometimes its the ramps that can't handle the weight. There should be weight ratings posted for the garage, but not always listed on the website.
I am pretty sure the Fun Mover line came in the Super C, I think you'd be much better off looking at the specs of one of those vs a standard C Class.
What are you looking to put inside?
As for the V10 depending on the year they are pretty solid. You're looking at 6-8MPG. I am doubtful that they RV itself would last 200,000 miles to be honest.
A friend hauled his toys with a Class C for several years, beefed up the suspension, Banks all that, even a heftier hitch, but none of that changed that the frame itself bent. By the time the damage was seen nothing much he could do.
Two Wire Fox Terriers; Sarge & Sully
2007 Winnebago Sightseer 35J
2020 Jeep Gladiator Rubicon