I had an 18 as well and I thought the body was all aluminum. Was there rust pitting or surface oxidation on the rig you saw?Funny you say that, first raptor i looked at to buy used was an 18. Wound up tracing the carfax (which was cryptic bat to some place in long island.) needless to say for an 18 there was a large amount of surface rust. I had to pass. Lots of trailer hitch wear too which is something i always look for.