There are no RWD Saturns that I know of. And the plastic body panels are cool but again, it doesn't explain why RV owners buy them up in droves yet they aren't very popular among normal car buyers.
Well I did some searching in Google and found an explanation for this phenomenon. Apparently Saturns are made so they can be towed with all 4 wheels on the ground with no distance/speed restrictions and it will not hurt the transmission or void the warranty. Evidently this is a pretty unique feature, and Saturn markets heavily to the RV community because of it. So there's our answer.
And as crazybill pointed out that Malibu in the photo is FWD. However it's very possible it has the same/similar tow-friendly transmission as Saturns have, which would also make it a good choice.