Thank you all for your replies and knowledge on this topic.
I really don't want to make this a China bomb thread and I apologize if I did. I'm sure everyone is tired about the same thing over and over.
I NOW know how to correctly read the GVWR and understand it. I was a bit confused but thank you for the clarifications. I will run it over a scale to know for sure and take it from there.
I just felt that in 2 years and 6 blowouts/flats later something else has to be the issue. Maybe also thought the Forest River might have to blame since they have had tire issues and recalls in the past. Just for clarification, I can not find any recalls on our model.
Many have asked about my speed, I usually travel around 65 mph, 70 if I need to pass. These D tires are rated for 65.
Someone asked about the breaks maybe dragging. I currently have the trailer on jack stands to keep weight off the trailer (just trying something different) and all 4 spin freely.
Someone asked about tire pressure, I keep them as per the tire manufactures recommendation. D tires I keep them at 65 psi, my new E tires at 80 psi. I check them before each road trip religiously. I carry a small compressor with me and fill as needed.
Also axle misalignment was brought up. Good idea! I have had tire failure in all 4 mount locations. If the axle was the case, wouldn't it just happen on the same tire constantly? I will still check it out. I guess the best way to do that is measure axle to axle on both side (driver/passenger) and the measurement should be pretty close to each other.
Someone also asked about potholes, curb and tight turns. No curbs, I don't drive like a maniac, I know the stretch of this road by now, to the point I know which lanes I should avoid do to the bad condition of it. Tight turns, the answer to that is yes. I have thought about this. This is the reason I now leave it on jack stands, tire off the ground. I am able to park it at home, to get in and out it is a tight squeeze. I do need to make a sharp turn to back it in. After I do back her in, I usually go forward and reverse a few feet to try and get that strain of the tires because of the turn. This has always stuck in my head as to maybe the cause, but then I think, if I always backup the same exact way when I park it, would the tire failure be in the same location? Maybe I just over think sometimes. Anyways, will see how she does with the tires off the ground next trip.
Someone asked about the tire heat. Like I mentioned, this last trip I installed a TPMS. The system also lets you know the temperature of each tire. I was watching this religiously. Right before one of the blowouts psi was at 68 and temp was at 104. I watched them the entire trip and no tire went above 106.
Also someone asked about the TPMS I purchased. This was my first time using it and I was happy with it.There is about a 6-8 second delay by the time the system picks up the signal reading. I know this because I heard the blowout first and it took a while for the alarm to go off on the systems headset. I did some research before buying this unit. One was that it reads over 80 psi. Some other systems out there do not. Has temp reading. Range was good for as per the reviews (from my trailer tires to the cab of my truck is about 37'). Another nice feature is you can set alarms for high and low PSI as well as alarms for temprature. Finally, the price was right for me at $70. Here is a link if your interested at the one I purchased. ***Link Removed*** Sorry, I can't add the link for some reason. I got it off Amazon, it's called CACAGOO Wireless TPMS Tire Pressure Monitoring System.
Thank you again for everyone's input, I greatly appreciate it.
I now have a few things to look into.
Stay safe,
Carlos