It is always interesting to watch these discussions. Those that are towing in the 21K area can certainly use a LDT for that. I would be the last to say that an HDT is a requirement. People choose HDTs for a variety of reasons....mostly because they tow any trailer well, and are more comfortable doing so. And they are extremely flexible. Those items are not important to everyone, or can be met by other trucks. Clearly an HDT is not for everyone. However, if you are towing a 23+K 5er it is certainly something you should at least consider. It will do a far better job than a Ram 5500 (which is the only LDT that I would consider for that load range). If you have a 16K 5er, I'd say you clearly do not need an HDT.