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A bunch. Why would you want to?
EDIT- I'm stoopid, I think you mean convert a 5'er into a gooseneck, right? It shouldn't take too much but it's hard to say without looking at one. I assume they use the 5th wheel for some good reason so maybe converting would be a bad idea... I don't know just thinking out loud here.
someone offered me a trailer house (modular home) frame with tripple axels and breaks converted into a flat bed 40ft trailer that is currently bumper pull for $150. it looks like it would make a good heavy duty trailer if it was gooseneak.
Ohh... now I smell what you are stepping in. I don't think it would take too much, but I've never really looked too close at how the gooseneck part of the trailer attaches to the frame. I would guess a welding shop could get you set up at a reasonable price.
some have breaks and some dont but the only prob with the axles is that they dont take a normal wheel. its kinda like some semi and larger truck wheels. now thats saying that these are the axles that came with the house.
i can weld but i don't have a welder big enough to do it myself. so i would have to pay someone to do it. the trailer is worthless to me as a bumper pull. it does have the trailer house axles. but that could be changed out at a later date. it has breaks on 2 of the 3 axles, it has the style with the e-magnets activating drum breaks. what i want to do is mount my 9.5 ft pickup box camper on the front with the bed over the top of the gooseneak and then have the back 30 ft or so for whatever i want to load up on there so that i have all the comfort of home when im out on the road with biult in storage compartments where the wheel wells go in the camper then re-side it all to match the new storage compartments maybe build a 4-5 foot beaver on the back of the trailer. but at the cost of a 40+ foot gooseneak and the fact that this trailer is practicaly free.
To do it right you will end up with at least as much in it as you would for a used 20 + 5 GN trialer. In my area you can find a good used GN with 7k brake axles between $2400 - $3000.
I would see how low the guy will go. If you can get it for under a $100 buy and pull it to the scape yard. Should be able to make a few hundred bucks with scape prices the way they are. This is a market for the mobile home axles and wheels as they are often removed when the home is deliveried. Craig's list is a good place to sell them.
It can be done but you will have to take it down to frame. Trash the axles and buy some good ones. My brother just built his second gooseneck trailer from scratch and this time it is a frame over wheels. Basically you are getting the frame rails. try etrailer.com They have all you need to build a good trailer. I would get the length of the frame you want then go measure a commercially built one that is the same length and take alot of notes. You will want to be sure your axles are located properly.
House trailer fames as in mobile home frames are made from junior I beams. The frame is made becasue the load is distributed out of the entire area. So while it carried the home that weighed 20k fine, if you put 10k torward the front, it will fold like paper. The axles are fine, the weak point is the tires and axle alignment. They wear those 13.5 inch tires out in a HURRY. You can buy an entire wheel and tire for about 30 bucks at any mobile home facility. These are also very simailar to the axles on the older triple axle construction trailers, but they took more time to set them up properly in alignment, and upgraded the tires significantly.
Even if you did do the conversion, it would sag, bend twist tremendously becasue of the lack of frame ties.
So do you pass on it? ABSOLUTELY NOT!!!!!!! PAY FOR THAT THING NEXT TIME YOUR AROUND IT, hook it straight up to the truck, haul it to your local scrap yard, classify it as unprepped number one steel, make your 750 bucks, invest it in beer, and then recycle those cans....LOL
I like Todd's idea better. He has a valid point about the frame being designed to hold evenly distributed loads. The trailers I have seen built custom used a significantly stronger steel.
Go get the beer money and keep looking for some scrap "I" beams and build one yourself. Or drop the coin for a true trailer.
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