If you can do a bit yourself it'll save you coin, you say it's not in that bad of shape so I'd probably just fix it up. Would have to be cheaper than a newbie

 Yep you can get trailers refurbed by trailer mobs.  fremantle trailers can do it. But you have to weigh up cost vrs new.  

What size trailer, single or dual axle. R u looking at regalving?

Personally if you cant do the work yourself buy a new trailer.

Pm sent.

 Roadmaster will recon a trailer as well, but do your sums, I fixed up my last trailer myself and buying retail to fix stuff, 

I might as well bought a new one in the end.

Unfortunately what has been said above about cost is true.
However you have alluded to it not being to bad, without seeing it it's a bit hard to give an opinion on what would need to be done to get it licenced.

Take it to some one that refurbishes trailers, there is one in Mandurah, and there are a few in yellow pages I think. Get them to give you a quote and then see what a new one is going to cost.

If you are going to take it on a long trip the very last thing you need to happen is for the trailer to cark it.

 Hey, I don't suppose you bought a swiftcraft with the 4 stroke yammi on the back.

Good points - I'm certainly not handy with steel work or a welder so from some of the comments it looks like a newbie might be worth the extra money / less hassle.

I'll have a chat to Sea-Kem and get his thoughts. I might also try to take it in somewhere for a visual and a quote. I'll see what I can find around the Rocko/Mandurah area, ill need to look into whats required to get an unlicensed trailer around. 

Yep thats the one - the 5m swiftcraft with the yammy. You know it ?

 Not hard or expensive, get them from Transport dept offices. Think they are only good for 1 day at a time, could be wrong? 

As others have said, you can spend a lot on them. I do all my trailer work myself--they are mechanically obviously very simple, if you have basic tools and are even a bit handy you can do it all yourself. Your major problem in the end is rust--if it is made of RHS/SHS ( box) section steel, and is rusted from inside, it's pretty well stuffed. Sure, you can weld bits in and get it re-gal'd, and thats getting near the price of new. I've gone as far as building a new one for a 6m boat from scratch,and having all the components  galvanised, but that's a job I wouldn't recommend to anyone but the committed. 

Thanks Ranmar - what do you guys find the most expensive parts to be ? I'm guessing it's the little things like rollers, LED lights etc 

I'll call a few places and get some quotes on the galv dipping, I'm guessing the old stuff needs to be sand blasted off before it gets dipped again. I can see the costs mounting up already haha

I know that replacing the axle, suspesion and hubs can be reasonable costly aswell - from memory it was about 600-700 bucks for heavy duty single axle (thats about the limt of what I have done in the past). 

The current trailer has boat slides instead of rollers - just appears to be metal tubing covered in carpet. Does anyone here with a fibreglass boat have a trailer with the blue sldiing material instead of rollers ? Interested to hear if that damages the gel coat at all.

Thanks for all the replies - big help ! 

 Does the axle really need replacing, for example. Really bad scabby surface rust doesn't really make a difference to its strength, But badly rusted springs, where it's just one big lump, certainly do.  Are the hubs really stuffed, or just unsightly? Studs are easy to replace, and cheap.Good LED lights can be had on ebay for around $100, just make sure they have long tails of cable included so they can be fed straight into the plug instead of making joints.  Probably better with wobble rollers instead of hard bunks, IMO, but buying them and the mounting brackets will start to add up. 

Ifyou want to know the price of this stuff, get online and find Martins Trailers catalogue. You can shop online or download a PDF, I have found it very useful in the past.

if the frame is still sound, they will dip it in acid to remove the old gal before they redo it. Not cheap, but if it is sound, may be worth it.  I spent $1700 on my current trailer which came under my current boat--it was undersized for the weight of boat, but in excellent order otherwise. Went to Roadmaster who built it, and they sold me the bits to covert to tandem and re-issued the VIN to reflect the changes. One day I'll buy a boat with a good, suitable  trailer that doesn't need work or replacement

 Thanks for the follow up and all the input - I'm waist deep in research figuring out what I might need, what things cost and what I can do to improve the trailer. 

I'm spending a bit of time down at the ramp looking at how other fibreglass trailers are set up, so if anyone see's me snooping around your trailer with my dog at the Bent St boat ramp, then rest assured that I'm just looking for ideas haha