If you see something wrong with your driveshaft, I'd replace it... Stranded on the side of the road SUCKS.
But knowing you might have a problem carry tools with ya.
OK, I bought my M1009 in sept. It had a vibration like the driveshaft was bent. So I took the rear driveshaft out and duct-taped a paint can lid over the tail of the transfer case to keep the fluid in while driving. I obviously locked the front hubs and put it in 4-wheel to drive without the driveshaft.
It turned out to be a wheel out of balance.