Tire Issue

Ok just to update, after all the information I received I decided to go with the sailun st235/8016r G 14 ply 4,080@110 psi. So went to the local GY dealer as he had my tire & I wanted to make sure it was 110 psi rated rim. So he got the tire & started to look at outside of tire telling me its right on the tire. I said no its on inside of rim, not the max tire pressure but the max psi rating of wheel, he didn’t seem to know this.. No where on the tire did it give the psi rating. I asked him how I could find that out or could he & he said the only way to find that out is to call where your trailer was made & find out what wheel manufacture was put on. I then asked him to price the sailun tire, said he couldn’t get it but had no problem with me getting it & that would mount them. I then inquired about the GY G614 but told him price was to high & I would also need new rims as from what I have read you need 6 ½ rim for that tire. He said that he saw no reason that that tire wouldn’t work with my rims. At this point I took my wheel back & headed home to find out what my rim was rated at. By chance I seen something on the inside of the rim, it was the word : SenDel, figuring it may have something to do with the manufacture of wheel. Googled it & found that it was a manufacture of wheels. Had umber so I called. Guy was very helpful, I told him what I was trying to determine & that the psi rating wasn’t stamped on rim. But it did have a rating of 3580 lbs. He said the only tire they made with that load rating & 8 lug was designed 11 years ago for a specific motorhome manufacture & only was rated for 80 psi. He was very informative on my tire issue. I inquired about what wheel (model) I would need. I seen several that had a rating of 94 psi max, he said I would not be able to use that if a 110 psi was needed. I looked at the site later & I think he was looking at wrong rim as the only wheel as he stated with a 3580 was rated at 94 psi.Pasted from site: T03-66866T** 16x6 8/6.5 +0 4.90 3580 @ 94 PSI but he said 94 psi wouldn’t work so not an issue. So I need 4 new wheels as well as the sailun tires. Not many places sell the sailun tire, so was wondering if anyone who might have ordered them could tell me a realiable site I could order them from. Also a site for good price on wheels although I would probably just get locally. One other question is the load rating of the rim that is stamped on inside of wheel. The sailun is rated at 4,080 . This is pasted from the SenDel site : T02-66867T** 16X6 8/6.50 +0 4.90 3750 @ 110 PSI As you can see it is 110 psi rated but the load rating is 3750 where the sailun tire rating is 4,080 .. How critical is it the rating of the wheel. Would the 3750 rating be ok for the sailun wheel?