TireHobby
Well-known member
Ok pulled the plug today and replaced all my Towmax with Firestone Transforce HT LT tires. As I intimated earlier, the problem may not be as much poor quality of tires but poor selection of tires by Heartland. They choose tires that will last from the factory to the first campground because that is where a large majority of their rigs end up so why spend more money on a tire that will last thousands of miles of travelling if it is just going to sit for the rest of its life in a local campground.
Daggonit I always take a lot of heat for pointing out regulations. But sometimes it needs to be said just because of the safety factors.
Having a great feeling about tire strength can just go so far, then you're going to run into snags.
The absolute minimum standard for tire fitment to RV trailer axles is to equal the manufacturers GAWR for that vehicle. The manufacturer does that and places their selection on the vehicle's certification label.
Now vehicle owners do not have to abide by what the manufacturer has done. But the rule is to at least match the Original Equipment tire selection by the manufacturer with size/load capacity. Some will argue that. I can provide dozens of references that support the manufacturer's selection.
Now, let's get to the point at hand. Putting two tires rated at 3042# ea on 6750# GAWR axles is not acceptable by any standards. I know the TransForce HT LT comes with load capacities of 3415# and 3640# but they are normally too tall or wide for RV trailer axle usage so I suspect you're using the popular LT235/85R16E size. The 2013 specs for the BC 3690 SL says it has 7000# axles. And I have no doubt that it does. However, the vehicle manufacturer can lower the rating on those axles to allow them to set a valid GVWR. I'll bet when the certification label is checked it will depict two 6750# GAWRs. I checked a lot of certification labels last year with GVWRs around 15500# and every single one of them had GAWRs of 6750#.
I read and notice tire things in numerous forums. Sometimes owners just don't now they've created an unsafe condition for themselves. I hope this post will open some eyes and get people to do deeper research on their replacement tire options.
TH