I know it is a small TT, but I suggest first to take it out of the bed of the truck (should only take 2-3 burly men) and connect it to the hitch receiver on the back of the truck. Will pull a bit better that way...
I could jump on my urge to poke fun at a blue oval, but I will hold back.
What do you feel? Is it bouncy? Does it sway a lot? Some more insight on what you are experiencing might help diagnose it.
It could just be too light on the tongue. Maybe a lower drop on the hitch or a little more weight to the front could help, but yes, get it looked at to ensure the whole thing rides as designed.