Well, the GVWR is the maximum the truck can weigh when fully loaded. However, I had a 1999 Silverado (ext cab, 6-1/2' box) that I seem to remember weighed about 5,200 lbs empty so you would probably be over the coach's limit even with an empty truck. You could check the Chevy's door sticker to see if the UVW (unladen vehicle weight) is listed. To see what the truck weighs exactly, load it up with whatever you plan on taking with you -full tank of gas, bikes, firewood, etc. and head to a public scale. I think that you will find a Dodge Dakota or Chevy/GMC Colorado/Canyon are more within the coach's limits.