GKMAC....5.4l Should be just fine. Just make sure you have a Transmission cooler, and take it easy on hills.
My Grandparents used to pull a older heavy 26 foot TT with a late 80's 2wd Ford F-150 ext. cab with a 5.0l, it barely pulled it up some hills, but it worked for them! They kept it maintained and it ran great up till the day they sold it.
My truck does just fine, but I complain to the wife hoping she'll break down and let me buy a diesel!
Congrats to you also on you new Zinger, and enjoy!