Tag axle
 

Anyone ever put a tag axle or an axle you could release pressure on via airbags or some type of cam mechanism so tight turns are easier and more support on open roads. I'm thinking about adding an axle. Trailer would then be quad axle

BigSilverCat did. Have fun.

https://www.offshoreonly.com/forums/...50-skater.html

I'm speechless 😮😮🤤🤤🤤🤤🤤

What's the reason for the 4th?

Didnt like the way my boat was hanging way off the back of the main frame of trailer. It has long very heavy cypress bunks but it' still wood. I think its a bad situation and doesnt provide enough support to the hull over long period. I moved the boat up about 14 inches and I have about 6 more I can go. Looks much better now and trailers better. Adding another tag axle will add more support , have less trailer flex ,less tongue wieght and track even better. My 320 had triple axle which i thought was just right. This boat is 9 ft longer. I realize a 4 axle trailer can really kill the tires on tight turns which is why im looking at tag axle. Leaf spring with air bag. Tires would still be on the ground without much force until air bags are pressurized. Also going to add more bunks, bow catch and guides so I can drive it on trailer without a miss. Like pool ball in the pocket.

The way it sat when I bought it

What size axles are under the trailer now? they look like 6 lug 5200lb.
If it was me I'd rather have a new trailer built with 3 7k axles rather than add a 4th. that trailer looks small for the boat anyways IMO

If I was going to use that trailer I'd refit it with three 7K's and move them as far aft as possible.

Thats a thought but I still want the extra support. Boat is 9000 dry and I did move boat forward 14" I think those are 5000 each I'll have to check

Here is a closer pic 6 lug wheels. I got rid of one of those cheesey roller guides up front and added 2 6ft long bunks up front until I can get to the rest of it

+1

Ken

Three axles is more than enough with correct axles.

DAMMMM!!! LOL still that boat isn't parked on that full time is it? And im not driving a tractor trailer either.

The way your boat sat originally, the motors and drives (i.e. most of the weight) were 8' behind the rear axle! I'm sure it tows a ton better now that its been moved forward, but its probably not enough. Tongue weight is key to trailer stability, and I bet you still have almost no tongue weight. Honestly, the trailer is too small for the boat. The transom of the boat shouldn't hang behind the frame. It looks like a bolt together trailer, which is going to flex a ton. You can add axles and bunks and move the boat around, but it will never tow as nice as a welded Myco, Manning, etc. Depends on how much you tow and how far on whether its worth it to invest that kind of money into a trailer.

Tongue is very heavy. Don' know how much . One reason why I want another axle. It is a magic tilt. Aluminum I been.

Just get a properly designed trailer. Boat isn't that heavy compared to lots of boats on here that sit on 3 axles. My cafe weighs more dry and it sits and tows fine on a 3 axle

youre trying to over engineer something that has a simple solution

Right now I would say motor mounts are just ahead of rear frame.

It wont cost much to add some bunks. Yes a better trailer would be nice but for now that one is what I'm using. Don't know why they used that trailer but I have seen it on other Florida boats. I'm pretty sure came from the factory on it. I might be able to find a used one but I would rather put the money into the boat. My 320 had a nice performance custom trailer under it. That was a nice piece fit like a glove. The current boat has pad bottom and 25 degree deadrise.

This is the only current pic I have of back of trailer. It is much furthr on the trailer than it was. When I bought I had to pull it up some. Then moved it another 14. It isn't bad now

It tows pretty good considering the truck I'm using. This summer I towed to Alexandria Bay .70mph there and back. It does flex which is why im looking for more hull support and reduce tongue weight some. It will be stiffer on the road with another axle. But maybe a couple years i can get a better stiffer trailer.

Good evening.
The rule in boat trailer design is very simple. The dimension from the transom to the centre of the axle or axles is 5’.
thats as complicated as it gets. In your case it’s from the hub of the centre axle to the transom.
if you set it up with that dimension it will tow like a dream. Tongue weight should be no less than 300lb.
if you call velocity they’ll send you a plan to layout the bunks in the right place.
If you weld the new bunks in place and the new required cross members the trailer will stiffen up. I rebuild and customize
I beam trailers all the time. The 5’ is an industry standard.

The other posters are correct. A fourth axle is not required. Especially for a boat as light as Velocity builds.

thank you.the tongue is way over 300 by far I'll check the 5ft rule. Where are you located

2 hours north of Toronto on the Trent Severn Waterway.
Cheers

It looks like the boat is riding up on the bow blocks and lifting it off of the two keel supports. Try lowering the bow blocks and let the keel supports take on some of weight. This should remove the positive arch in the I beams and reduce the flex you're experiencing. I'd be willing to bet there's very little contact between the hull and the two most forward keel supports.

If that doesn't remove the positive arch in the trailer the axles are going to have to be relocated further aft.

The 2 front supports you see in pic were just keel rollers I moved one forward and put 6ft bunks in place of 2nd roller. (Remember those pics are when i picked up boat). Can't see them in pics. The last pic they are installed. You can also see where I shortened the main bunks at rear. After thne boat was moved forward the bunks were about even with bullet case where prop shafts start