wantabe351 wrote:
...On a Cat Scale my Montana axle weight is 12,655lbs with 7k axles(axle tag) but a tire limit of 6750lbs...My tires are the Goodyear Marathons 235/85-16e's....now after the third tire going bad.. last week was my third tire..tread is deformed from belt elongation...2011 Montana3400L with W/D and a Gen is heavy but not over weight(limit of 15,650lbs)..so when i get home Im going for all new tires I want a LRG tire but its hard to find a good tire,but going to a 17.5 rim/tire there a about 7 good brands to choose from..Now Herecules has a LRF and Kenda has a LRG and both are 235/85-16. the rims on the 5er are rated for 110psi so the rims i have will work.....any thoughts
Looks like you made the same error most RV owners so. Assuming the load on your tires is perfectly balanced 50/50 axle to axle and also perfectly balanced side to side 50/50 on each axle. In reality your loads are probably closer to 45/55 or at least 47/53 so if you choose the better case one axle has 53% of 12,655 or do the math and we see 6,707 and with one side at 55% we calculate 3,354#.
I find an ST235/85R16 LR-E
Power King Towmax that is rated at 3520# Max at 80 PSI Min with a MAX speed of 65 MPH. If your trailer is better balanced than many per example above you only have a 166# margin, which is a long way from the suggested 15% ( 528#)
It is STRONGLY suggested you re-weigh the trailer with everything you normally carry (MAXIMUM LOAD) and follow the instructions
HERE to calculate the individual tire load.
Also are you using a Digital pressure gauge that you have tested to be sure it is correct? I have posts on my blog identifying thea approximately 10 to 15% of the gauges I have tested are more than 5 psi off. 5 psi in your tire size is worth 160# capacity.
Note it is not unusual to have one tire carrying almost 1,000# more that the lightest loaded tire so my example above is conservative.
You can learn more about the special problems with multi-axle trailer tire application on my blog post of 11/20/13