Not all of us need or want a an HD truck.. Heck, I only tow about 5-6 times a year and even if it was a larger, heavier trailer, I'd still only want my F150..
Now, if I had to have a #9000+ GVWR travel trailer.. Sure, I'd have to reconsider my choice of truck.. Even thou my particular F150 has a stupid "tow rating" of over #11,000!!
I'd run out of payload, GVWR and rear axle weight long before I'd come close to that "tow rating".
I'd feel comfortable going up to a #7000 TT without blinking an eye with my F150..
Margaret, don't try to shop by what the web page ratings say.. Those are "at best" and "properly equipped" and NOT what you are going to necessarily find on a dealers lot, especially if looking for used.
Keep looking and that "gem" will find your way.. Until then, enjoy the ride you have and don't stress it! :) I know, easier said than done, but still.. ;)
Mitch