Hi RECON & Welcome to FTE!
I had to do the same thing about three weeks ago, bought my truck out of Southern Cali. It had no cord. You are correct and not to hard to get to or route the cord into.
I started at the front and fed the heater end past the tow hook & kinda down the frame rail & by the motor mount and above the starter. Used a coupel zip ties to secure & screwed it in and you are done. Only used a few times as we have not seen any bad cold weather YET................ But I do love heat after about two mins of running! Heck last Saturday we made it up around 55 deg. Guess I can live without a white Christmas this year!!