Shopping for a 3/4 ton, What fit issues should I expect?

.....jack extension bolt-ons are available for some jacks; I can't tell from the photos if your jacks are round or square leg?

Really REALLY pay attention to the rear truck bed opening width vis a vis your existing (or contemplated) truck camper rear tub width (as Kohldad writes, above). You can get the truck bed widths from truck manufacturer's up-fitter web databases (like GM body builder up-fitter drawings for all years light-duty truck models, here--> )