You’re pulling a little trailer with a little buggy on it.
Get a hitch extension, plug it in and go tow the trailer.
Why did you start a second thread?
To put to rest all the hand wringing, check this out.
Similar vintage 3/4 ton truck with a shorter short bed, OE 2” receiver, 17” OE rims with 4000lb Toyos on them, WAY heavier camper that overhung further than your camper does on your truck, tailgate on the truck, 18” hitch extension bar, and a MUCH heavier trailer with guaranteed more tongue weight than your estimated 600lbs (which is probably a bit conservative anyway). Made the trip from here to Anchorage in the spring time with 6,969 frost heaves encountered on the Alaska Highway.
No issues then, nor the thousands of more miles with the same setup but different similar sized trailers. Only hauled that trailer once to move a few of our belongings with us to AK.
Your
Setup
Is
Fine