Not an A Body question
that will change how easy it is to tow not the total towing capacity if im not mistaken. springs or hd air bags can add to the total weight capacity. personaly just for the safety aspect of towing bigger brakes,trans,motor, stuff like that with a bigger truck would be a better option but not in the monitary part. depending on what trailer you are going to look for is heavily influenced by how big your truck is and how much it can tow.