Drill out the stud or the nut. Or grind off the stud and nut. At this point the stud and nut are no good so just get it apart. Then you can get a new stud and nut.
Well going by a picture. The trailer is worth $600. The boat $1800. The motor $2400,
So yes buy it now. If you dont like it you can always sell it and get your money back.
You will have to drill lots of holes. One in the middle for the pin is about 3" dia. You have to buy the hardware separate. Get out the drill and giver.
Like GCD said the most important thing is to build it strong. A heavy backing plate with washers to make sure it wont pull out would be good.
"Cars, passenger vans and SUVs are not permitted to tow more than one trailer
or one vehicle."
You would be over the tow limit on these vehicles anyway. I think it is legal and i have seen people do it. Must be a pain though.
Why would you need to check the bolts on a new trailer. That is nuts. Maybe the people building the trailers should check them. I didnt know it was some assembly required on a new trailer. Just buy a trailer and put it together yourself.
Wow that is unreal. The boat is aluminum so it wont rust. Because the boat is new i would take it in at the end of the season and have it repaired by the pros.
Next time go in and get the coffee.