Sorry, but your signature didn't show up. I get the idea that you may have a SRW 2003 3500, but I'm just guessing.
If so, just be aware of your GVWR and GCWR numbers when you're looking at 5vers. For "worst case" thumbnail calculations, use the 5ver's GVWR as an actual loaded weight and figure at least 20% of this weight will be pin weight on the truck (charged as truck GVW). I'd suggest staying within DC's ratings for civil/tort legal reasons if nothing else, but others have differing opinions. As a rule, 2500's and SRW 3500's will tend to run out of GVWR before they run out of GCWR when pulling a 5ver.
Insofar as the hitch is concerned, I haven't heard a lot of complaints from owners of sliding hitches. Most users I've seen say theirs work just fine.
Have fun looking and making your selection - we've found that's one of the most enjoyable (and, yes, frustrating) aspects of RVing.
JM2CW
Rusty
Towing a 36' triple slide 5ver - 10,380 GVW/10,500 GVWR; 21,180 GCW/21,500 GCWR by certified truck scale loaded and heading down the road.