Interesting thread and definitely has me thinking.
One thing you may want to think about is doing some research on the newer diesels because they all utilize diesel exhaust fluid (DEF) which has really improved the emissions systems and significantly reduced the EGR cycles. Although I use my truck primarily for towing in the summer I do find myself using it through the winter for short trips and the emissions system is virtually invisible in it in that I'm sure it goes through regens at times but there is no sign of it. Saying all that I am aware that short trips is still not ideal for them but they are much better equipped for it than pre DEF trucks like yours were.
Just something to think about because although I'm sure the gasser will do the job I think it will be a disappointment after pulling it with the 6.7L Cummins that you have now. As an added bonus the newer trucks are much more refined than the previous generations. JMHO.
