This is our third summer of owning a GMC motorhome and I thought I would share what she has cost us so far. Lots of people are looking for a deal on a cool old GMC motorhome, sometimes a good deal can cost you a lot. It helps if you are handy and can do much of the needed work yourself. In the end, this is probably not a good investment but it's a fun hobby and a great way to go camping and meet interesting people!