As a pretty committed RVer, I have spent plenty of time with folks who own these things. Bottom line is that, when the are good, they're great. When they are having issues, which is far from unusual, you're pretty screwed. They are an extremely complex, fairly delicate Mercedes product. I recently was pumping diesel into my old Cummins engine powered RV when I was approached by a new sprinter owner. He was nearly out of fuel, we are in BF Iowa, and he is specifically forbidden to put any bio-blend diesel in his 2014 Sprinter. The locals told him he was screwed, since that's all that was available. Mercedes told him to find a tow truck. They have know issues that can be mind-blowingly expensive to repair, and competent repair facilities are few and far between.
As for the rationality of dropping 50K to drive two small spawn to school, well that's a whole other level of idiocy.