Re: Towing trucks
Sorry Ken, I was stating a mathematical fact, not a definition.
CCC = GVWR - (minus) the empty weight
is what I was trying to say and did kind of say, but I admit that my words and math interlaced with potential for confusion. I would never claim GVWR = (equals) the empty weight, at least not while still sane (some claim I've already passed that point

)
And no, a trailer does not weigh its GVWR unless it is completely loaded. However, it is safest to use that value AS A REFERANCE when matching it to a truck. Except for Sunnybrook, apparently. GVWR is a value you can count on, unlike the dry weight from the factory or an average weight of stuff used by RVers. If your dealership weighs your trailers ready for sale and provides that to the customer, then that would be a value which could be relied on, and if a person also knew for sure the maximum weight of the stuff he would ever be carrying, then he could compute a Loaded Weight, which might well be substantually less than GVWR (almost certainly for a Sunnybrook), and use that value safely to match to a tow vehicle.
Your dealership is better than most, and it sounds like Sunnybrook is better than most, so my advice is of less use to people getting that trailer from you. If everyone would buy Sunnybrooks, from you, I could shut up. However, for everyone else, I feel it is good advice to keep in mind. Particularly for people who want to tow RVs with 1/2 tons. Even if a person drives off the lot with a well set up rig, there is a reasonable chance that future change in the people and/or contents of the trailer or truck will slip into overloaded territory.