Is this a tranny problem

[azureblue]

Am now driving a 2003 Dodge Caravan. I know this is a Mercedes site but you guys are such a rich source of technical info, I would rather ask where I know people know what they are talking about!! Sitting in drive, at idle on about a 40 degree or so incline, this "tin can" started rolling backwards unless I had my foot on the accelerator! Is this normal for the vehicle or is an indication of the usual tranny problems these vehicles have? Had to give up my 85 500 SEL and miss it like hell! Only plus is that I bought for 5,000 under value from Uncle Sam, GSA vehicle, low mileage, 51,000, and in great shape. Am I looking at putting what I saved in the darn thing at some point?