one thing is to make sure you have grease on the bearings which i am sure you are already doing. But also hook your boat up and go to a level area and step back and see if its level, or measure the bottom of the frame at the tongue then in the back. IF your riding to high your putting more stress and heat on rear axle and if your to low your doing it to the front. The only reason for having multiple blow outs and if its not due to being to old is you have the wrong ratings in tires and need to go bigger and or your tires are getting to hott from what i mentioned above.

K how about numbe of lug nuts? I will need new rims also since min are 14's.... Is 5 lug ok or do I need to upgrade to 6 or 8? Any good websites for combos? I was looking on east marine earlier.

If I decided to sale what could I sell a used aluminum trailer with all new tires for?

I have a 32 Baja on a tri-axle with 225/75/15 Goodyear Marathons I used the first set for 6 years averaging appx 3,000 miles a year and never blew a tire. Purchased a new set of the same three years ago and still working great. Have you checked your alignment from axle to axle. Have seen some tandem and tri-axle wear out the shackle insulators and mess with the allignment.

Seems like 14" are to small for a 31' especially loaded with fuel and all your goods..

What's the supposed load capacity of your trailer? Even though it's a tri axle it sure sounds like they either under rated the axles as well as the tires. There's no way you should be haulin around a 31' boat on those little 14" "C" rated wheels and tires. Those tires are rated for a small car not a heavy trailer load. Bigger rims and tires, spin slower at highway speeds, larger diameter. You should be running a minimum 4500lb axles, 6 lug with 16" rims and "E" rated tires. Trailer tires, not car tires. Trailer tires are designed to handle greater side loads while turning etc.

My 31 sits on a triple axle with 16 inch 8 lug nut rims with load e range tires. Never had a problem.

Where is the date stamped on the tire?

Contacted loadmaster and sent them pics to get all specs and axle weight. How do you check axel alignment?

trailer/boat weighs 9860lbs. Steel trailer/tandem 6000K axles (8 lug) on LT245/75-16. Some cheap tire brand. Boat lives on trailer except when used and I keep the tires out of the sun when parked. Tows great with zero issues so far. Grease seals are another issue.....

if you have 14'' tires with 10'' brakes which were stock then you have a 3500lb axle x 3 which gives you a 10500lb carrying weight..

I'm not a big fan of radial tires at all, use to work in a GY tire shop years age and always saw the GY marathons xplode,even after a years use and with the proper tire pressures....

I have the same 10500 lb weight rated trailer and my formula sits on it which is 9500 lbs + fuel..i dont run radial tires, i run bias ply, they seem to last a heck of allot longer then a radial..My ``8 donzi also sits on a tandem axle trailer with bias ply tires and those tires have over 10 years of use and never a issue..

I have a friend that has a 89 baje 23 dvx with a eagle trailer,same thing bias ply tire that date back to 1996 and no issues..

in my eyes i think the marathon tires are over rated, their has to be some kind of a design flaw because i keep seeing multi issues with them blowing out..

Im sticking to my bias ply tires when i replace them at half the cost and twice the life..

Also if you are thinking about switching to a 15'' tire and wheel make sure you have enough clearance between the tire and the fender..