Put your new hitch bar and ball in the hitch, get a measuring tape, and
then stand on the ball.  Measure the distance from the bottom of the
ball hitch to the ground.  This MAY be lower than 16 1/2 inches.  Your
weight will approximate the weight from the trailer on the hitch ball.

Get a level, and level your unhitched trailer.   Measure from the bottom
of the part that goes over the ball to the ground.  This will give you
an accurate measurement, not just what the manufacturer states. You want
these to be about the same.  2 1/2 inches is a little more than I am
comfortable with.

You want at least 10% of the loaded weight of the trailer to be on the
hitch.  You may have to get a scale and measure the weight that will be
on the hitch at the height it will be sitting.  You can actually use a
bathroom scale for this.  Put the scale on the ground, and cut a 2 X 4
or 4 X 4 to the right length (so that the trailer will be where it would
be when hitched up).  Put the wood on the scale, then lower the trailer
onto the wood (until the front wheel is off the ground).  Adjust your
stuff in the trailer until you get the right weight up there.

I don't THINK that will matter too much, but just to be sure, are BOTH
vehicles on level ground, when you are mesuring the tongue height?  I drive
a Tahoe, and I had to turn my stinger over to increase the height for my
Rockwood 2516, compared to other trailers (not RV's) I have towed.

You didn't look around enough.  Longer "drops" are available but, due to their
increasingly low demand (the longer they get), they won't be found retail.

Probably not, given your tow vehicle.

Then again, the Tahoe/Yukon is a shorter wheelbase vehicle.  When towing, a
LONGER wheelbase is better than a shorter one.  For safety's sake, you should
probably try to level the trailer.  See you if can get your money back for the
5-1/4-inch drop drawbar then go on-line and ORDER the appropriate drop drawbar.

Bottom line is that you want your trailer to trail level to the ground.  A
couple of inches might not make a lot of difference; it can vary with
different rigs.  If you find that it trails nice and does not wander you
might just be fine.
Tomes

The stupid thing would be NOT asking the question!  If you have concerns,
there are a number of very experienced people here that are more than
willing to help out new folks.  Just remember (and this is NOT a slam on
anyone here), it is the internet, and some of the advice you'll get is
worth what you paid for it.

Hi,
You should load up your trailer and tow vehicle as you would for travel
then hitch them together on level ground.  Now check and see if the
trailer sits level.  If not measure from the front of the frame to the
ground, then measure from the rear of the frame to the ground.  Subtract
the smaller number from the larger and that is the size of the drop you
need to add to get the trailer level. Doing this will take into account
the tongue weight of the trailer and suspension of the tow vehicle. A
little high 1/2 to 1 inch is better then low to allow for additional
weight you may put on the trailer or in the tow vehicle and suspension
wear over time.  

When the trailer is not level it can cause problems in certain
situations.  If the front of the trailer is high, hitch ball not low
enough, a sudden or panic stop could lift the rear of the tow vehicle
reducing rear braking.  If it's low a sudden or panic stop could push
the rear of the tow vehicle down lifting the front of the tow vehicle
affecting steering and front braking.

During normal towing and stopping the hitch height doesn't matter as
much, unless it's way off,  it's just when bad things happen that the
hitch height can make things worse.  How much depends upon the
combination of the tow vehicle and trailer and how they react together.

Take Care and Happy Campin...

With a 21" height you have to have a raised vehicle.  I week stingers with a
lot more than a 6" drop on some of the trucks.  Ask at the place you got the
parts to raise the truck.

Hi Kid,
We to have a Jayco with the 14" suggested height. It is pretty low! We have
to use a 6" drop on our 4x4 F150. The problem we had before getting down to
the 14" was the back of the trailer dragging on driveways, etc. The extra
height in front translates to decreased clearance in back! Good luck, Steve