#1 & #2 I have the Tereflex BB lift and IMHO it has worked out great. It pretty much retains stock handling. However, if you think you may add steel bumpers and winch you may want to go with a coil lift so your suspension won't sag. I am running 315/70R17 tires and there is no problem. (Well, a slight trimming of the air dam may be necessary. Super easy.) For 100% road & DD you will be fine. Now with shocks I would recommend Rancho 9000s 29XL and 30XL they are adjustable. They get great reviews on this forum.
#3 Sorry, can't help you there.
#4. Both tires are awesome. I recommend you go with the Duratrac. It's lighter and better suited where you live for snow and rain.