When we bought our fiver (used) it had 235/8016-E?s on it. I don?t recall what brand they were because I didn?t even recognize the brand. The first thing I noticed when we got it home was one of the tires had a big swelled ?goose egg? on the inside of one of the tires, even though the tread looked great. We went with the Goodyear G614 RST tires. I put on the 235/85 size, load range G, which was slightly taller than the originals but they had plenty of clearance. There are quite a few tire makers now that make some great tires, even from overseas, so actual brands is something you should research pretty closely instead of just internet opinions.
Although some E rated tires were right in the capacity range, quite a bit of our driving is out in the Dakota?s in the summer and it gets plenty hot. It is amazing on those trips to see how many RV?s on the side of the interstate changing tires. Maybe not so amazing considering how many people pass me like a bat outta hell while towing and we usually run between 65-70 MPH depending on conditions.
They are kind of expensive, but I am the kind of person that probably goes overboard when it goes to safety margins. So, depending on how you drive, the driving conditions you expect to be in, and how you load up your RV, and your personal risk comfort level should maybe go into your considerations for your tires selections. Also, if you consider upsizing tire load ratings make sure your rims can handle the extra pressure. The E rating tires I had were 80 psi, the G rated tires I have now are 110 psi. Luckily I didn?t have to swap out my rims.
Happy travels to you.