My trailer has a front wheel like this one attached. The place I store it under my deck, I have to wheel it over the grass and the current wheel tears up the lawn. It's a 12 foot jon boat  with a trailer to fit. But I made some modifications to the boat that added a significant amount of weight so now it tears up the grass. I was thinking of getting something like this. http://www.dunbier.com/options-accessories/white-wheel/ I can't seem to find one available in America though. Anybody encounter anything like this? 

You may be approaching your dilemma from the wrong direction ~

Perhaps installing some type of stone or narrow brick path to ferry your rig on could work to eliminate sod damage.

A-Jay

 

 

I would approach your idea a little different.  I mount my spare tires on spare spindle and hub assemblies that fits the trailer so if I were to ever have one go out on a trip, I have all the parts.  If the spindle gets damaged, it's usually a lot easier to find someone with a welder than a replacement spindle.

Northern Tools usually has everything you need to make a spare spindle and hub assembly.   Get all the stuff to make one the same as on your trailer, they also have the tires.  Take that picture and the parts to a metal fab shop and get them to make you one.  Then in an emergency, you will also have a spare of everything that fits your trailer.  Now, you will be out a couple of hundred bucks to do that, but I'm pretty sure if you find that piece you are looking for, it's not going to be cheap. 

 

Also, if you done that much to the boat, you might be too heavy on the tongue and need to adjust where the boat sits on the trailer by sliding it back to a closer balance point over the axle and repositioning all the roller, bunks and stop.   You need to pay attention to you tongue weight and not have too little or too much.

a couple pieces of 1/2 inch plywood works wonders, just lie them on the ground where you intend the jacks wheel to navigate, leapfrogging each other as you move the rig.

 Its what I do when I need to move my boat over grass without the trucks help.

I don't have a solution but the link you posted seems like overkill

Isn't that what a trailer dolly is for?

http://www.ebay.com/itm/Tow-Tuff-600-LB-Trailer-Dolly-TMD-600AFF-/262739678875

Sometimes the simpliest answers slip through google searches (and my mind). A trailer dolly seems like a good solution. 

 

Thanks for the replies!

Is the trailer that heavy?  I Move my uncle's 14' jon around, on the trailer without too much struggle.

50 minutes ago, J Francho said:

Is the trailer that heavy?  I Move my uncle's 14' jon around, on the trailer without too much struggle.

Very easy to move around on pavement. Trailer + Jon boat were very easy to move around then I added probably about 100-150 pounds extra to the jon boat and it makes the jack wheel dig into the soil in my yard. 

Gotcha.  The trailer dolly is a good option then.  Years ago, I put a trailer hitch on my riding lawn mower to move the boat around at our cottage.  That worked well for the 22' Four Winns open bow.  Another idea.