I recall reading about that in the manual that came with my 02 Tacoma. Check
your manual - there should be info there.

 Most hitch bumpers are either 2,000 Pounds trailer/ 200 tongue
weight, or 3,500/350.  I will guarantee you that the limits are either
stamped right into the bumper steel in plain sight, or are printed on
a permanent sticker attached near the ball opening.  Look.

 And hitch bumpers are safe, but In My Humble Opinion only for
occasional use and only with very light trailer loads.  And only after
you crawl underneath and make sure that they used the right Grade 5 or
Grade 8 bolts and nuts, and they're all there and tight.

http://www.boltdepot.com/fastener-information/Bolt-Grade-Chart.aspx

 I seriously would not trust a factory hitch bumper for anything
approaching the "Official" weight limits, because they make the
bumpers as cheap as possible and their designs and weight ratings
leave very little safety margin...

 As you hit huge bumps way too fast ("Where the hell did that DIP
come from?") make a panic stop, or other severe movements like an
emergency lane change, the shock loads on the bumper and brackets go
out of sight.

 I've seen hitch bumpers twisted into pretzels in every possible
direction, but straight down and under seems to be the most popular.
My hitch shop has a big 'trophy pile' of mangled bumpers and cheap
hitches out back that they've replaced.

 If you don't want hitch failure on your list of things to worry
about, go get a Class III or Class V receiver hitch installed by a
reputable trailer supply or welding shop in your area.  They bolt, or
preferably weld, the hitch crossbar straight to the frame, and they
aren't coming off unless you take them off.

 Plus, with the different drop and rise receiver tongues available,
you can easily adjust the ball height to match whatever trailer you
are pulling, so the trailer rides level and stays balanced.

 I have collected an assortment of hitch receivers over the years, so
I can go up or down up to 8 inches.  Which helps when I try to hitch
my van (very low receiver, about 12") to a rental trailer that wants
the ball up at 20".

         --<< Bruce >>--

You need a trailer receiver, not that bumper mount.  Forget whatever specs
you find.

Yes

Yes

This information is usually stamped on the bumper itself, right near the
hole.

Bumper hitches are typically 2000 pound / 200 pound tongue capacity.

Yes, that's what it is there for.

The weight limits are stamped on the bumper or on the hitch receiver itself.