Need a gantry crane for a one time use.

Phew. Took a little while getting here again. FWIW, I think if the rock was dragged to where it is by tractor, then it can also be dragged onto a trailer. On the other end, tie the rock to a tree, and drive the trailer away.

Use some thick plywood on the ramps. Use chocks on the trailer wheels when loading. Use plywood and round posts for less destruction of the trailer deck. It won’t be pretty. It’ll probably work. Stay clear. But if you kill yourself, just know that some of us will feel bad about that. And some of us figure you deserve whatever outcome results. Some of us, it seems, are fairly certain we don’t care what happens to anybody but ourselves. Which doesn’t give me any warm fuzzy feelings about our advice.

Where I live, big rocks and concrete barriers are fairly common deterrents employed in the battle of keeping tractor trailers out of roads not built for them. Yet Ive been told that brick mailboxes aren’t allowed in areas where teens may entertain themselves by destroying said mailbox. We want to keep them alive and healthy long enough to be adults I reckon.

This summer a ten year old girl on a bicycle ran straight into my mailbox. She came away with some scuffs, but the box looked like a car hit it. Lol. I was happy to see the mailbox was the only thing needing repair.

Off topic; but I often see houses built right at the middle of a curve. Basically as if some schmuck never considered building a house there would endanger its occupants for all time. In those cases, I must say, my judgement is nearly always aimed at the home buyer. What idiot would buy a house on a highway curve? But again, your situation doesn’t seem anything like that.

Also, I’m still a bit jealous you have access to a giant free rock. At the same time finding it hilarious that many of us DO have to pay silly money to get ourselves such a thing. A thing which often finds itself right where nobody wants it to be, and then sold, and carted off by someone who wants it to be in the way of other things somewhere else. Ha!

Also, the best thing I accidentally drove through (as a passenger of a drunk driver) was a freshly plowed field. It probably saved my life. But the speeds in your case probably wouldn’t make that feasible. Lol
 
@jwmay Illinois is not real far from Wisconsin. My rock source would be more than happy to have you or almost anyone come and get rocks, big or small. The more you can take the better.

I did a rough design for a DIY gantry crane and the material cost alone is close to the cost of buying a new one. Plus all the labor involved. So that option is out. I am still watching for a used one to come up cheap online somewhere.

I am sure I can drag it up onto a trailer. It is the getting it off that concerns me. There are no trees poles or anything else substantial to anchor to to pull it off the trailer.

I have also been looking around at various local landscaping places for a "nice" rock.

I just had to move it back again. Someone with a white car pushed it about 2 feet. They also left behind a small piece of glass filled structural plastic. It is only about one inch wide by 6 long but is about 1/4 inch thick, being a filled plastic with a high glass fiber concentration says it was meant to be strong. Now it has a hole in it

Here are a couple of pics of the 400 Lb rock and its little brother.
In this first pic you can see the disturbed gravel from someone pushing the rock with a car. You can even see rubber on the new pavement saying they put some effort into moving it.

You can also see the type of intersection this is. It is not a street where speed is involved. there is a power pole across from me and the building across the other way has a 6 inch concrete filled post, and I have my 2 little rocks.

Rock 1.jpg

You can see how close to the corner I have to park my truck. Before the rocks and railroad ties my trucks have been hit by people cutting the corner short.
Rock 2.jpg

OK you asked for pics of car parts.
This did not take long.......

I think this is the inside of the part.
Rock Part 3.jpg

I think this is the outside of the part
Rock Part 2.jpg

Edge view to get an idea how thick this part is.
Rock Part 1.jpg


This is my truck. It is not little being full size, extended 4 door cab and 8 foot bed. I can take this corner easily so there is no car that should have any issues. You can see how far away the house is. My HOUSE has been hit by people cutting the corner that short.
20240916_172827.jpg
 
One way to anchor the rock when you need to get it off, is to use another vehicle, just set the brake and tie a strap to the vehicle and the rock then drive the trailer out from under the rock.
 
I thought of another car. But I think that a 4,000 lb car will just get dragged. The whole theory of getting a BIG rock is that a car can not move it and a big vehicle like a P/U truck could only move it with great difficulty. I would need another vehicle as big as my truck. I do not know anyone that has one.
 
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You mentioned having a source for a flatbed. Is it (or could you get) a lowboy instead? If so, how about renting a Lull (many are good for 5+ tons) and trucking it to the rock on the lowboy, then both Lull and stone back to place the rock in its new spot? A Lull would give you the ability to fine tune how it sits on the corner. Don’t ask me how I know that a large rock dropped off a bed doesn’t always land how/where you want it to…
Also: Lull forks could be a lot easier than getting a good chain/straps setup around.
 
You could use my dad's technique. Drive as fast as possible in reverse and then hit the brakes. Except for the time he forgot to take the tailgate off the truck and the wood did that for him.
 
Yet Ive been told that brick mailboxes aren’t allowed in areas where teens may entertain themselves by destroying said mailbox. We want to keep them alive and healthy long enough to be adults I reckon.
funny, right across from the high school up here is someone putting up a stone pillar for the mailbox. I don't know why, could be decorative, or preventative.
 
@jwmay Illinois is not real far from Wisconsin. My rock source would be more than happy to have you or almost anyone come and get rocks, big or small. The more you can take the better.
While I appreciate the offer, I think I’m at least 5 hours from the Wisconsin border. There’s got to be rocks closer than that. And my interest is very low. It’s more of a “if I find a big one nearby for free” sort of notion.
 
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You mentioned having a source for a flatbed. Is it (or could you get) a lowboy instead? If so, how about renting a Lull (many are good for 5+ tons) and trucking it to the rock on the lowboy, then both Lull and stone back to place the rock in its new spot? A Lull would give you the ability to fine tune how it sits on the corner. Don’t ask me how I know that a large rock dropped off a bed doesn’t always land how/where you want it to…
Also: Lull forks could be a lot easier than getting a good chain/straps setup around.

I like the idea.
but
A 3 ton lull weighs a bit over 20,000 lbs. add several thousand pounds of trailer to hold it and a big rock and you are talking getting close to 30,000 lbs. My truck would never move that more than a few feet let alone a 700 mile round trip.
 
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