I use a more sturdy tin can and it blocks the FOB signals. However the problem I have is that the car alarm goes off when I come back and unlock the door. Then I have to quickly get the FOB out and stop the alarm. Quite annoying.
The hitch safe sounds like an invitation to thieves as the know the FOB will be in there when you park at the beach. That sounds risky. I wish it was hidden behind the rubber plug so it's not so easy to see.
EDIT: stupid me. there is a plastic cover included to hide the hitch safe. Has anybody confirmed that it blocks the FOB signals?
It looks like the hitch safe has a mechanism to lock it in the receiver. Otherwise not much better than just putting it in a black piece of cloth and putting it behind the Jeep rubber insert of the hitch.
Still I have been in a ton of parking lots over my life as well as a ton of beaches and have not seen many, if any fiddling with a hitch and not trailer. I'm sure you could be discreet about this and close the rear hatch lock the doors via fob while inserting it into the rubber plug and slide it in all while slowly turning around and not looking awkward.
Truth be told there are few times I go to the water alone. Usually accompanied by beach toting ladies like wife or daughter with others that prefer to just mess around the waves at most. They always have bags, but I'm sure you won't have many would be Jeep thrives that are going around in cars and checking receiver plugs.
They could just as easily be checking wheel wells for magnetic key safes so many people have used over the years.
Crimes are almost always if big opportunity and very low chances of getting caught. Lots just have way too many eyes and often have cameras from some establishment which make odds of getting caught too easy.
Unless you like to dive and it swim at the port of Elizabeth or Newark, then I suggest taking your keys/fobs anyway. In NJ their more likely to car jack you at the mall than at the beach or shore. Plus they like bling type Range Rovers, Lexus and big Mercs to joy ride in/and or drive to departing cargo ships, a la "Gone in 60 seconds."
Just saying. This is why we have insurance. Plus in places like Vancouver, BC they tell you to leave absolutely nothing in the cars which usually deters break-ins.
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