Trailer dimensions

[Sweet P]

We haven't used our 2007 West Wight Potter 19 for a few years. Time now to renew the trailer. We are in the UK - we have owned Sweet P from new and she one of very few that made it across the Pond.

We need to replace the axle, hubs and springs.

Does anybody have the standard dimensions of these please?

Many thanks

[Dave Scobie]

Is it a US manufactured trailer? What brand is the trailer? LOTS of different trailer brands and designs have been used the the P19s.

[Sweet P]

Thanks Dave
I didn't know that!
It is an "EZ Loader"

[Charles Brennan]

Sweet P, Nowadays, trailers are generally rated by weight capacity and in those generalized weight ratings there are more or less, standard dimensions.

Your sailboat purports to be an empty weight of 1225 lb., according to the manufacturer:
https://sailboatdata.com/sailboat/west-wight-potter-19/

But most users report total combined weights of around 1600 to 1700 lbs.
Here is a table of generalized trailer weights  and GVWR (Gross Vehicle Weight Ratings)  :
https://www.curtmfg.com/trailer-weight
(Ignore the types of trailers, since no sailboat trailers are even listed and just follow the weight range.)

To get replacement under-carriage parts (Axles Springs, Hubs) look for the under-carriage ratings closest to your trailer's requirements.
Here's an example:
https://www.etrailer.com/dept-pg-Trailer_Suspension_Parts-sf-Axle_Beam-pt-Boat_Trailer.aspx
(Look at the axle capacity table filter, on the left side of the page.)
Your general weight range would suggest undercarriage axles anywhere from 2000 lb, to 2200lb, to 3500lb capacity.

Here is a link to EZ-Loader and although I had some of their components on my old trailer, (fenders) most all their replacement parts are fairly pricey.
https://www.ezloader.com/adjustable-brochure/mobile/index.html#p=10

I had an 18 foot Windrose (very close to your Potter's weight) on a trailer that I installed a 3500 lb undercarriage on, after I tired of burning up the 2000 lb capacity hubs and bearings, that came with the trailer.  But bear in mind, here in the States I was doing mostly towing on Interstates, at high speeds.  That may or may not pertain to your situation.

What you require will be more defined by the mission, than by what you think are standard dimensions.
If you only tow the Potter on the trailer a few times a year to put it in and out of a slip, for example, you may get away with a 2000lb or 2200lb capacity under-carriage.  If you do a ton of driving and in varying conditions and grades, a 3500lb under-carriage might not be as much overkill, as you would suppose.

Hope this helps,
Charles Brennan 

[Wayne Howard]

I had an 18 foot Windrose (very close to your Potter's weight) on a trailer that I installed a 3500 lb undercarriage on, after I tired of burning up the 2000 lb capacity hubs and bearings, that came with the trailer.  But bear in mind, here in the States I was doing mostly towing on Interstates, at high speeds.  That may or may not pertain to your situation.

Charles, Needing to upgrade to 3500 undercarriage wouldn't happen to be due to the 8 or was it 9 anchors you had onboard? 

[Charles Brennan]

Wayne, HEY!!  It was only EIGHT anchors!! And only HALF of them, were on Urchin! 
While it's true I have lots more anchors I found while scuba diving, thanks to Idiots that don't know how to mouse a shackle, I keep them in the garage and have been selling them off recently, to fund the SCAMP project.
(And make some more room in the garage!!) 

You cannot view this attachment.
1 ) 16lb Bruce w/100ft ½-inch rode and chain, on Urchin.
2 ) 12lb Danforth w/100ft ½-inch rode and chain, on Urchin.
3 ) 10 lb folding anchor w/100ft ½-inch rode and chain, on Urchin, getting re-purposed for the SCAMP.
4 ) 12lb Northill w/100ft ½-inch rode and chain, on Urchin, later donated to Travis Votaw.
5 ) 3 lb folding anchor w/75ft ⅜-inch rode and chain, on Mango Smoothie, my kayak.
6 ) 8lb mushroom anchor w/20ft ⅜-inch  rode, on Urchin mostly used as a kellet, repurposed for the SCAMP.
7 ) Sea Anchor used on Urchin, was a little too small and was re-purposed for kayak fishing.
8 ) 8lb Danforth w/100ft ⅜-inch rode and chain, on Short Ribs, my RIB.

Whoops! Forgot the Sand Stake!  OK, maybe it WAS 9 anchors!!
You cannot view this attachment.
One went with Urchin and I got a slightly smaller one, for the SCAMP.
The SCAMP will have:
1 ) 4lb Bruce w/ 100ft ⅜-inch rode and chain.
2 ) 8lb Danforth w/ 100ft ⅜-inch rode and chain.
3 ) 10lb Folding anchor w/ 100ft ⅜-inch rode and chain.
4 ) Sand stake w/ 100ft ⅜-inch rode.

FOUR anchors!! Not EIGHT anchors!!! 
Hey! I like to wake up, in the same place that I went to sleep!! 

Hope this clarifies,
Charles Brennan

[Sweet P]

Thank you Charles.
Some excellent advice here. When we were using her routinely (before the kids got too big to cope with us all on her in cramped conditions!) we were doing big miles (in UK terms). From the Midlands up to the Highlands of Scotland or down to the south coast and over to the Isle of Wight (spiritual home of our boats).
I am inclined towards the heavier load capacity you suggest.
Again, thank you!