Plan to buy a VW LT35 or LT46 and use it as a camper and towing vehicle for the caravan

Hello you love here in the forum. I don’t know if I asked my question in the right subcategory, but I’ll try it. If it’s better off somewhere else, please move. I’d like to buy a VW LT35 or LT46, which I’d like to remodel in according to my wishes and in the case of my caravan 1800 kg tandem. My choice is the 2.8 liter 156Ps, that’s a fact. Now ask me a few questions about transmission translation and the a 1. Is it right that the LT46 is translated shorter than the LT35? 2. If so, how does it affect the speed band? Difference at the same speed. 3. What can be expected to be the consumption of both vehicles at about 120 km/h cruising speed and 70% capacity utilization of the max paint payload. You can never say that exactly, but a rough direction would be great. 4. Of course the LT46 has twin tyres, only I think he will be able to enjoy himself more. I would like to change that to my needs. At the moment I have a Tahoe GMT900 5.3 as a towing vehicle, but I always get annoyed to invite all the accessories from the trailer back, because unfortunately I only have a limited load for it. Therefore, the idea came to me to use a box van combined and without caravans also sometimes on weekends small T Rejoice me if someone here could give me answers to my questions. Greetings hansvamp15