RDanley,
I will go "against the grain" on this one;
2wd offers several advantages, including;
- lower height/more clearance for 5ers. Yes, you can raise your 5th wheel, but that has an adverse effect on wind resistance and stability.
- No posibility of Death Wobble
- cheaper to buy and less systems to repair once off warranty
- better fuel economy.
- more payload (same GCWR, less truck curb weight)
some disadvantages;
- I do believe 4x4's have better resale value
- 4x4's are way harder to get stuck and have enhanced control in slippery conditions
You can see by my sig, that despite the above contentions, I have a 4x4. That is because with my truck camper I often travel on poor gravel roads and camp in rough spots. I also require one for my use in the winter. We get lots of snow here. I believe that a strong argument can be made for a 2wd 5er hauler, especially as the 5th wheel gets to be a large one. Like anything else, you need to buy what is best based on your useage.
As far as the trannies go, again its personal preference. I bought the NV-5600 for the additional two gears and the fact that it is very strong and reliable. Stronger and more reliable than any automatic. If I lived in the big city and spent alot of time in traffic, I may have gotten an automatic instead.
Hope this helps,
Dave
ps. The auto and stick both have the same GCWR (21,000 or 23,000 depending on rear end ratios). The auto does weigh a couple of hundred pounds less, though.