My mates dad has one, with a 2 stroke 135. 115 is a bit small but probably OK but will  struggle when loaded.

Solid boat, harsh ride but if trimmed it is acceptable. Good first boat.

Offer then 16k and see how you go.

Plenty of boats at good prices on the market so offer less considering its got a 2 stroke.

I had one also with a Yam F115 4 stroke.
Loved the boat, unlimited range (250 litres) tough and don't need to worry about marking it.
Did many Abrolhos trips with 2 or 3 of my kids.

Downside-as John said harsh ride but VERY stable and while we did more than a couple of runs home in 20-30 knots breeze, I never felt the slightest hint of pushing it past its limits. My back did though at times.

Seriously the boat will handle far more than you and for $16-$20 its a good deal, I sold mine for $32K a year back but with an anchor winch etc.

115hp-mine was great (20kts@4000rpm, 32@6000)but loaded up with 3 blokes, 250 fuel, eskys, water, dive gear etc it was a serious load it would still plane easily but with another 400rpm

Wow, 32 knots with a 115 yammie 4 stroke......115 2 stroke should be fine then. I stand corrected.

As Rob said, Trailies are not fancy, but they are solid, reliable and a great stable platform.

Sorry this should be on your other post but anyhow

Had trailcrafts before good tough boat but get slapped around in chop

Also had a voyager before with a 115hp yam 4 stroke and was probably the best out of 7 boats that I've had. Paid 16k for it with 800 hours. Max was 34 knots

http://www.boatsonline.com.au/boats-for-sale/used/power-boats/voyager-ltd/133507 (No its not my boat for sale)

I know you said aluminium but so did I at the time and ended up with this model! Maybe a bit of TLC needed as with most things. 

http://www.boatsonline.com.au/boats-for-sale/used/trailer-boats/westerberg/140196 Not bad either

Good luck mate

Hi Josh my mate recently bought a brand new trailblazer 590 with a 115 merc 4 stroke.  at full WOT with 3 people and calm conditions it max's out at 25 knots, with a 4 stroke its not ideal to be sitting on WOT for long periods but with the trailcraft hulls 16-20knots would be the avergae cruising speed as with most aliminuim boats that size.

With the one you are looking at I think if the motor runs well and your happy with 2 stroke then thats not a bad price, if your handy you can do a bit of work to the trailor yourself, any 2nd hand boat you should be looking at wheel bearings etc straight away.  Fishing 4 people out of a boat that size unless your anchored up chasing some herringetc is a bit difficult but thats up to you.

That second boat bruce recommended is very similar to mine except mine has had a few modifications done to the transom and layout by the previous owner.  If your interested in that one here is my 2 cents, Firstly I can 100% guarantee you that westerberg is not a 1997 hull.  That one was definately made before the 90's as they changed the design on the front of the hull as they were getting a bit of water over the nose.  So unless you fit a clear across the front and sides of that bimini you will get wet in rough conditions buit it looks like it needs a bit of TLC and at 15k or whatever you get it down to you can spend a bit if you want.  For any westerberg the manufacture month and year is stamped at the front of the boat where you hook your trailor winch on.  No problem with it being an older hull mine is 20 years old no cracks in welds or any dramas, they are built more like a commercial grade boat than a rec boat

Dont be put off by the size of that motor on the westerberg mine has a 90hp 4 stroke johnson/suzuki and I can get 34 knots WOT which is way too fast IMO it gets pretty skittish at that speed.  Westerbergs were generally built out of 5-6mm ali all around so you are getting a very sturdy boat which will leave a trailcraft for dead in heavy seas and are alot more stable thats for sure.  That trailcraft will weigh hull only about 600kg, the westy will be over a tonne.  Sea trial anything you buy you will see the difference in alot of boats

good luck with the looking

See the spec

http://www.trailcraft.com.au/trailblazer/590trailblazer.html

thats the exact one my mate bought just remember that is without a 200kg? motor and 100l fuel

They dont has as much metal in them as some boats, but my mate got that brand new 50k with absolutely evrything ready to go which was a pretty sweet deal 5 year warranty I think

 Had a 470 freestyle before and I've got a 640 trailblazer now, it had a 135 2 stroke merc with similar hours. Max speed on glass off day with 3 ppl was 34knots but cruise usually around 22knots loaded up. 115 would probably be fine for a 580,have Since upgraded the motor to a 225 4 stroke for economy and extra power.  

Can ride a bit rough as others have said but you get a good solid plate Ali boat. It is a good bang for your buck boat with plenty of deck space. It is an Ideal fishing/diving boat

Get the Motor checked out and offer a few grand less, would not be a bad deal and You get a lot of boat for under 20k! 

I tested a 570 trailblazer about 5 years ago when I was looking for a new boat, love the layout and heaps of fishing room with a good cuddy cab. I just couldn't handle the harsh ride and ended up getting a glass boat. That one looks like good value the motor will be a bit thirsty compared to a 4 stroke but you could re power it in a couple of years if you wanted. There is good and bad with every boat so best bet is take it for a test drive and see what you think.

How long ago did you test it? haha

they are good boats but a 2 stoke merc with 920 hrs I would be a bit worried about that just about due to thro a rod I would say

6.10 Trailcraft centre cab, with 150 4st stroke Yammy has pulled 41kn on a flat river trimmed way out. Doesn't give you much steering at that speed!

 Ended up offering 16500,gonna hear back on Monday