[Christ]

Itbs are sure to remove any chance of low range torque that you might have had using that triple knocker, unless hou do some sonic tuning for helmholtz (SP) frequency and specifically design an intake runner which takes advantage of it and keeps intake velocity high enough to retain a high volumetric efficiency.

You may not like the idea, but adding a turbo that will spool at 2.5-3k rpm and a dump injector on a MAP switch will get you a quick boost in power when you need it, cheaply and safely.

You don't need to be concerned with overloading your suspension if all you're doing is flat towing or dolly towing. If you're trailering at all, install overload springs and rear tires rated for more load than the 155R12 that came stock. You may consider something in the range of a 175/70R13, mostly having ratings of ~1300lbs at 35-40 psi, as I recall. Plenty for your application.

Get yourself an rv brake actuator that hooks into your trailer plug, and a brake controller. This will allow you to use the towed vehicle's brakes to assist stopping/slowing.