need help with tear drop

Hello there, my name is Rambo, I'm new here and would like to get some help about tear drop.
I live in thailand and will try to build my tear drop here so please don't send me to the local dealer for parts since there is no local dealer here!!!
There is no tear drop in thailand at all as far as I know.
1. I would like to know what is the best way to seal the back door against the rain, (what kind of rubber)
2. many pepole wrote about used axle, what's wrong with making one with an ordinery steel, does anyone can say what the thickness of an axle like this should be ?
3. Most of the tear drops I saw on the net made out of wood (beside of the chassis) does it strong enough ?
Have a nice day
Rambo
I live in thailand and will try to build my tear drop here so please don't send me to the local dealer for parts since there is no local dealer here!!!
There is no tear drop in thailand at all as far as I know.
1. I would like to know what is the best way to seal the back door against the rain, (what kind of rubber)
2. many pepole wrote about used axle, what's wrong with making one with an ordinery steel, does anyone can say what the thickness of an axle like this should be ?
3. Most of the tear drops I saw on the net made out of wood (beside of the chassis) does it strong enough ?
Have a nice day
Rambo