Cant you just use a bathroom scale. Cut a 4 x 4 the right length stand it up on the scale and lower the hitch on to it....If you max out the scale which there is a good chance you will get two legs, 2 scales and a cross support spanning each leg under the hitch. Add the weight of the two scales together and there you go.
Kind of half assed but like you said you will probably only do it once or twice.
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1986 V-20
1986 Yamaha 150 HP
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