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If you are really blocking up you grill then you should try wrapping your headers to keep some heat out of the engine compartment and keep the EGTs up since you're not a hot rodder. At least it help the airflow in the exhaust system if it doesn't do anything for your heat situation.
I've had some real hurdles when the words "work" is involved. I often maxed out the GVWR on deliveries, but not anymore. How much work and pulling are you doing? That is a tough compromise. I am thinking about starting to hack away at all the unnecessary metal, get some nice aluminum wheels and a different rear end......or dump my 6.0L F350 4x4 dually with a 4.10 rear and go with 4x2 Cummins of your vintage. That's a great ride you have. The bed is a nice place for fuel saving gear or an extra radiator, but the stuff you carry in there may also feed you.
The Cummins forum is a great place for info. If you really want to get crazy you can look into: 4btswaps.com
I've been dealing with a steel flatbed all these years since my employees would have ruined anything else. It's taken me 2-3 years to get from 10mpg to 17. You have better fodder to start with.
I would definitely not be afraid to go with 5W-30 synthetic as long as you don't start leaking oil and maybe change out your differential fluid for something lighter if you aren't pulling much and/or install a differential temp gauge to watch it if you are.
-matt
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