Gross Vehicle Weight Rating (GVWR) is the total weight the vehicle has been designed to carry. Keep this in mind when looking for pickups. Keep in mind that you will want a tow package on your pickup of choice. An auto tranny will have more tow rating than a stick tranny. Shop trailers, and look at the dry weight of the trailer. Then add up all the weight of all the bikes, fuel, riding gear, tools and what ever else you might have. Then add up the weight of the trailer loaded, combine that with the weight of the pickup and you'll get the GVWR of the pickup. If your weight exceeds the GVWR of the pickup, look for a tow vehicle with a higher GVWR.
Way to often someone will buy a trailer without really concidering the amount of weight they are towing.
Rick