A gvw of 6500 would yield around 850 lbs tongue weight. 6500 -850= 5650 lbs on the 2 axles. 5650÷4 =1,412.5 lbs per wheel at max trailer weight. So a wheel rated for 1,900 lbs would give you over 500 lbs. of reserve capacity per wheel. I wouldn't worry about the "mis-match as the lowest of the numbers (the wheels) will have plenty of reserve.
If you go with a D rated tire then you can put 65 psi (according to your numbers) but it will not increase the load capacity beyond the original 6,500 lb. GVW of the trailer.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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