You should be able to get the towing specifications from your GM dealer who sells GMC. You should be able to safely tow the maximum specifications as determined by the manufacturer. Just be sure you know how those specifications work.
Any trailer must be under ALL of them with the most important being axle ratings and GVWR ratings because those are safety related specifications. Of less importants but still important for towing satisfaction is to stay below the maximum trailer weight ratings and our understanding that those maximum ratings are for a completely empty truck. Adjustments would have to be made to account for any other weight in the truck (cargo, passengers, non factory installed accessories etc). One last thing you need to keep in mind is that brochure weights for an empty trailer have nothing to do with what you can tow unless you plan on towing a completely empty trailer. Even options installed on the RV will change those weights as they are not accounted for in the brochure. Its always best to base towing decisions on the trailers GVWR (the most it can weigh). If you can't tow it fully loaded, it's too much.\
Good luck and do your homework. Remember that even within the model year and truck brand, there are many DIFFERENT specs depending on how your truck is equipped. / Skip
