Well I use my truck to tow. Its not my DD, so about the only times I get it out is to tow my 27ft enclosed trailer. I can't imagine that being fun to tow with at 4,000-6,000 plus elevation with a big single.
Twins seem overwhelming. Just reading I decided I'd go with a big single due to budget and ease of install. Plus just the look of all that piping, can look really good or really bad. Ur kit looks great I hope u get it where ur happy with it.
So running high 1400's is normal? Man I'm sure regretting not going with 40 overs when I installed new injectors. Probably run a little cooler.
That's one other thing I need to check. So many gauges to look at all while hauling ass and trying to stay on the road haha.