I'm not sure exactly how big of a truck you are looking at, but you might consider looking at getting a transfer case out of a heavy duty pickup truck. Many don't need the front output shaft connected to anything. It might be a bit pricy still once you adapt everything you need to put it in so researching what you have and what you can get will be important.
As far as transmissions for loads though I prefer a wide ratio where I can start in second when unloaded or not go into high when pulling loads, but that is my preference.
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