i also have the hitch ball just on the bumper. i also have a 4 banger with manual trans.! the bumper is rated for a 2000lb trailer and 200lbs tongue weight.
200 lbs is a lot..!! ..probably way more than on a 2000lb trailer unless the load is way off balance. anyway i towed a boat and trailer that weighed almost exactly 2000lbs with no problems at all.
i would estimate that the tongue weight for that trailer was no more than 50-75 lbs.
personally i don't think my little 4 cyl engine could tow more than 2000lbs anyway, lol.