Hi. Is there any appreciable difference between these generations of JD/Frontier rotary cutters? The dealer I'm getting my 2520 from is offering either a Lx4 or RC1048 (never been sold on either - just been sitting around) for $1k. This would be a great price for a RC2048 and I was just wondering if these older models are basically the same - just older. Or if one or the other (LX4 vs. RC1048) has any distinct advantages. I have not had a chance to drive out to the dealer to look at them but I'm hardly an expert and would be hard pressed to notice suttle differences, anyway. Apparently all are i-match, LX4 has chain guards front and rear while Frontier model has rubber guard on either front or rear - that is the only difference he was aware of. Thanks in advance.