There's a few (relatively) cheap things will will help you greatly, if you don't have them already.
First, I'd recommend installing two 5" electric fans on your transmission cooler, you can either set them up to turn on at a certain temp or run a basic +/- wire setup to the cab and flip them on once you hit 180* on your Gryphons ATF temp gauge. May want to swap out your AT fluid for high temp/heavy duty full synthetic. Whole setup will cost around $100 and takes maybe 2 hours to install and wire (if you do fluid its around $7 a quart and I think it takes 14?)
Second, you are going to want either Super Springs or air bags to keep your a$$ from dragging. Super springs run about $375 a set and take about an hour to install (they add 2,000# of spring to help keep your leaf springs from getting over stressed), airbags are I think a tad more.
Third, you will need a NICE weight distribution hitch with dual-cam or a comparable form of anti sway. You're basically towing a 30+ foot sail behind a relatively light truck. It can and will push you around without a nice anti-sway setup.
Lastly, remember that when you're towing a trailer that weighs more than your truck, you need to have the trailer brake harder than your truck does (Prodigys call it a "boost level"). These are usually measured as a +% (+25%, +50%, etc) mode. You will probably want the trailer braking around 50% harder than the truck, but the manual for your brake controller will give you specifics.
PS- MPG-wise, expect around 11 mpg with a tail-wind and 7-9 mpg with a head-wind, cross-wind, or when going even slightly uphill
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