Here is some Prospector info for 1987. It is basically a group of options combined. For 79 it was probably fewer options.
There is very little info for the Round Up that I can find. I've seen a few trucks over the years. I'm guessing they were all 4 wheel drive due to how the sticker is constructed.
The best info I have is from member *79POWERWAGON*/*DYNOTUNE* (Thanks) The "Round Up" trucks was a limited/regional/promotional package that was intended to increase sales of 4X4's in the '78/'79/'80 model years.All trucks(including Ramchargers) would have had the Round Up decal on the rear of bed (but not necessarily the stripes down the sides).Optional were big blocks and 5 slot chrome wheels like the Red Express.I do not have the original tailgate to see if spur/western theme decals matched rest of truck.My truck is
not that heavily optioned:plain bench seat-no tuff wheel-vinyl floor mat, but did come with 400/4bbl 727/np203-light conv.package and chrome front and rear bumpers to match wheels,other Round Up's may have more options depending on location or specs.of dealership orders.Round Ups were avail.in Brite Tan Poly metallic(AY70MU3),black and ...? Info or corrections on this or any other special(decal)packages always welcomed.
