If you have an Ace Hardware nearby, you can get one there.

Use a bathroom scale and the principle of the lever:

http://www.vintagetrailersupply.com/7West/TongueWeight.jpg

Chock the camper wheels sufficiently that the trailer will not move AT ALL.  
Jack-up the tongue and, using a short length of 4x4 lumber, lower the tongue,
via the lumber, onto a common bathroom scale until the dolly wheel/post is
SLIGHTLY off the ground.  This is, of course, assuming the weight will not
exceed the capacity of the scale.  If there is any doubt in this regard, use
the lever & fulcrum method linked to by the OP.

Probably not but it never hurts to be sure.  The tongue weight should be at
least 10-12% of the total LOADED (ready for camping) weight.  The greater the
proportion of tongue weight to total weight, the less likely the trailer will
tend to sway while being towed.  This is a primary safety issue.

The next time you are loaded and ready to take off, allow time to go to a
certified scale (truck stop, grain elevator, etc) and weight the whole lash-up
then the tow vehicle separately to determine the trailer's real weight.

The weight claims by manufacturers and their glossy brochures are notoriously
inaccurate, often UNDERestimating the actual weight significantly.  A trip to
a scale is invaluable.

You would do well to consult a canvas repair business (tent and awning
company).  They may be able to do a better repair for less money and hassle
than you'd think.

Mail/web ordering is your best bet for most things related to RVing.

<http://www.campingworld.com/browse/skus/index.cfm/Outdoor-and-RV-Accessories/M
aintaining-Your-RV/Freshwater-Systems/Water-Hoses/Water-Hose-25-ft/1/2-dia/skun
um=4520>

Good luck and have fun!

I have a 1206K, the tongue weight is much closer to 200 pounds. You will be
fine.
Scout

"Archi1" <

get a leather awl at your local camp/backpack store...

john

Sorry to get in on this late, been working on a message board I run for a
muzzleloaders club (http://www.epmuzzleloaders.com)

You can do what I did with the Allegiance.  I took it to a local Coop and
they allowed me to weigh it three ways for free, YMMV.  

I drove the whole rig onto the scale and weighed it packed to camp in, a
full tank of gas, myself and my father-in-law (instead of his daughter)
sitting in the truck.  I figured his weight would be enough more than my
wife to approximate the addition of our young grandkids those times we took
them camping.

Then I drove forward until the back wheels of the Durango were off the scale
and they pushed the button again.  Lastly took the hitch off the ball and
balanced it on a handy piece of 4X4 wood I had brought for the task.  

The difference in the last two gave me the tongue weight.  I was happy to
learn that we were *well* within the weight limits of everything, and the
tongue weight was about 11% of the trailer weight.

This only took about 15-20 minutes - I would recommend it to anyone who had
the least concern about the weights that they had.  Personally, I was
pleasantly surprised by how much I had over-estimated the total weight of
the rig ready to camp in.