To sum it up in two words, "FORGET IT". If you have to depend on a friend, he/she will lose patience very quickly and since you obviously don't have the skill sets to act alone your best option is to purchase a used RV. I have seen way too many such attempts fail losing money and time. Who was it that said that the road to Hades was paved with good intentions? Anyway, you don't want to travel this road in my opinion. If you insist on this attempt get the word Dodge out of your vocabulary unless you buy a new diesel.
Yes, I'm harsh, but honest.
Marvin