how to make a wooden trailer sink ? ? ?

Not even boat-builders use 1/12ths . . .

 

AK the term Minch and the term Mensch..... minsch (sp) are vastly different. A mensch in yiddish vernacular is a person of considerable kindness and merit. I am not jewish but that is one that some of my aquaintences use. Minch is a whole 'nother deal and yes it is in the urban dictionary. I have never heard, that I recall, the word minch. Now I have, and I have explored its meaning. I did not really need to add that word to my vocabulary. Amazing, the things we learn on this forum.

 

make the trailer out of lignum vitae or ironwood, simple

 

For me, if I want to make something that sinks, all I have to do is build it to float.

 

If you leave the trailer in the water for a while, it will stink eventually, so it just takes time.

oh wait, I got that wrong. If you want to make a trailer sink, I would make one from fiberglass or concrete, one from wood isn't so durable,
those are usually called troughs.

But if you want the wooden trailer to sink and not make one, putting wheels on the boat is a great idea,
or better yet, make your bike into a boat and forget the trailer.

 

I launch kayaks and canoes from the bed of our 14' utility box trailer.

So I'm with the other poster to install a plywood platform and launch boats w the aft end of the platform at water level.

 

Ran across this, thought it would be helpful:

 

Back to the OP's original question, filling the tires with liquid should help tremendously, it is commonly done with slow moving heavy equipment, though usually only the bottom third is filled as an aid to stability. Fully fluid filled, the tires will no longer be buoyant, which is probably most of the current problem.

 

They would fit into brackets, lift out, dip in water, set back in brackets. Drain at leasure. Rocks or sand would be a lot more work because they drain poorly.