I'm with Festus, I'd either find the "low temp" additive for the washer fluid or on your fuel or overnight stops heading north, keep checking auto parts stores for the "cold climate fluid".
And FTM is correct, No RL, from '06-'08 came with a factory hitch or wiring harness, several have added with ease either aftermarket hitch from CURT MFG or the OEM hitch. OEM wiring harness highly recommended, aftermarket wiring harnesses cause all sorts of electrical issues, and the OEM kit is very easy to install. Start using the Blue search bar this forum almost everything has been covered, many things more than once.
Two cheap, easy to pack things you could do once take possession, cabin air filter & headlight bulbs.
Clean or replace your own cabin filter, improve air flow & save a bundle A dirty CAF can cause all sorts of issues, it takes less than 15 minutes and a new one is less than $15, and not worth the $70+ most dealers charge for the task of changing it.
Headlight bulbs dim over time and this time of year the days are short and you may find yourself needing to drive at dusk or even night, two bulbs, a lightbulb grease packet and some latex gloves can all be acquired for less than $30 and changed in less than 30 minutes. But it's not a task I'd like to do in the rain or snow or subzero temps of MN in January once home.
Sounds like a great truck and fun trip getting to know your RL.
Best of Luck, and Enjoy the Ride!!!
Post some pics once you get it and even on the trip...