"Richard J Kinch" wrote in message

If there's a "penalty weight" over 4000, then I would suspect they
deliberately chose that weight as a pricing trick. Something close to,
but
below, what the typical user requires. Kind of like leasing cars with
free
miles that are below what most people drive.

Why do you suspect that? I've loaded plenty of containers that are much
larger than that with much less weight. Depends on your use. They should
tell you up front what the deal is and you plan accordingly.