here's an update.

i added some tie downs. some D rings from harbor freight. i attached them with 1/4 inch rivets. i had to buy a heavy duty riveter, also from harbor freight as my hand riveter and electric riveter weren't big enough to handle 1/4" rivets.

the only problem now is the d rings rattle when i tow the trailer unloaded.

my only concern is that the rivets will hold. they seem to be the weakest point. well, the rivets themselves will hold, but they might pull thru the aluminum deck and frame. but beings that it's just a bicycle trailer i won't be applying a whole lot of stank when i tie down my cargo.

all this work and i haven't even used the trailer yet. it's been cold and snowy. when it's not snowing it's raining. when it's nice out i'm working.