Toytech Ultimate Lift kit for 2003 DC

I've been reading the FAQ's and posts in this forum, and am strongly leaning towards purchasing the Toytech Ultimate kit for my 2003 DC 4x4 in the next couple of days.
I am looking at ease of installation, and for the most part would like to maintain the quality of ride. I need to get this purchased, and since I have limited mechanical skills and patience, will probably have a mechanic friend do the install for me, and I'll assist or get in the way.
I will need to purchase tires as well with winter rapidly approaching, and am looking for clearance in the wheel wells for tires/chains as well as a little additional ground clearance so I can REALLY get stuck when the snow gets deep. I have 2 sets of OEM wheels, one 15" and one 16". I'm leaning towards firestone destination MT tires, as the reviews from tire rack seem good and they look like they should do well in the mud and snow. Toytech currently has the AAL, but not the rear spring replacement set.
I probably missed the answers/recommendations in the search of posts, but if you would kindly give me your recommendations I'd appreciate it.

Also, I tow a 19ft travel trailer (4000lbs) a couple times a year.

Thanks.

 

Would a new spring pack be a better ride than the AAL? Anything special I should consider based on occasional trailer towing?

Based on my description and mechanical shortcomings, is this the best route to go for my needs of additional clearance/lift?

Finally what tire size should I look at after the lift is installed. Currently running 245/75 16's in the spring/summer,and in the late fall winter running older Schwab wild country RVT's 235/75/15's because they allow me to run chains on all 4 w/o tearing up the wheel wells. With the 16" tires, chains on the front currently are questionable. Thanks again.