When I put new axels on my trailer I had to custom make the saddle that I used. I took the trailer to an allignment shop and the guy checked it for me. I have no idea what he checked and my trailer was a dual axel, but I trust this guy to do all my cars/trucks. I am running a dual axel trailer on my Formula 302 and it towed up to Maine last fall no problem.

Ok new information...... I scaled my boat this weekend... Boat and trailer came in at 10,340 lbs.... My trailers axles are rated for 10,500 is this ok? Also my current tires are C rated and rated for 10,560 lbs which means they are running at 98% capacity all the time. I also found out via Goodyears website that if you are running an ST tire (which marathon is) and running anywhere between 61 and 76 mph you should inflate the tire 10 PSI higher than the sidewall rating. I was hoping I ccould maybe find some load d or e 14inch tires so I don't have to buy all new set of wheels and tires but I have yet to find anything. Seems all 15in tires go upto D and to get to a load E tire I need a 16inch tire.

Hancock R08 8ply
are D rates in the 14" size
Look for info on the Toyota motorhome forums,
it also came with 14" tires and many of the owners have the same
problem of finding 14" tires with a high enough rating for their motorhomes.
Here is one of the tires:
http://busdepot.com/details.jsp?partnumber=RA08
http://busdepot.com/details.jsp?partnumber=RA08

Man, that's awful close to the limit - even though the limit has a factor of safety built in. If it was me, I'd upsize to get the greater capacity. Then again, I'm running 15" tires for a boat and trailer combination that's less than 4,000 pounds.

You could go up in tire size/rating, but you still have 10,500# rated axles

axels are fine your tires arent. I would want a bigger wheel but if not just get new tires in D or E range and youll be set. your tires are so close to the brink thats nuts

K sounds like I am going to pull the trigger on new 15 in rims and tires. Everyone I have talked to recently with sonic 31's has the same axle capacity.

Did you talk to Jimmy that is down at the Moors? He also has a 31 sonic. See what he is running. I would for sure step up to 15 inch tires and wheels. How much fuel was in your boat when you weighed it? If you were light on fuel remember that fuel weighs like 8 pounds a gallon...check ebay..they have some good deals on wheel and tire combos...

You can get E rated tires for 15 inch wheels with Maxxis and Carlisle tires. Seems Maxxis is a more sure bet at 150/tire. That was good information about the inflation. Anyone running 65psi on the Marathons?

We decided to put the trailer up for sale instead and I am looking at a new manning. I was also worried about the axle weight for the weight of my boat and turns out Ron manning has owned a few sonics an is ver familiar with setup. I honestly think his would make someone with a lighter boat a great trailer. If not he offered me a trade in and I will just do that.