Does anyone know of a website where I can find the gross vehicle weight of vehicles, where one can easily plug in the year, make, model and find the GVW ??
Depends on what you mean by GVW.
Likely due to the fact the multiple options offered buyers makes such a site practically impossible.
Every option changes the weight.
The ‘vehicle research’ link on this site (look to the left on this page) will give you the manufacturers allowable gross weight of each vehicle (if that is all you’re looking for).