I thought we had gotten away from G-vans. They used to be the longest trailers AF had, in the early days. We still have one or two, all ancient.
Other than in "select" markets, it seems unwise to have such trailers. Far too easy to be overloaded, putting the driver in the uncomfortable position of refusing to pull them (justified), or to take one (risk) for the company. It is far too easy to overload a 40' G-van. Even more likely than a 53'. There are many drivers that will keep loading trailers until full, with no concern for the weight, thinking they are doing a good deed. We're not talking about just a few hundred (or a thousand) pounds over, either.
Did RC mention if these were new units, or old remnants from the past?