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Check cold and keep them as close to max as possible (75psi min). Don't worry about hot pressure.
How close are you to maxing them out? 2500? 2000? Distribute your load if possible and check your weights. Have you towed long distance w/ this trailer before? If you are worried about it, get the next load range tire (Don't forget to change the spare too.) Peace of mind goes a long way when towing....
As long as the tires are not weather checked, cracked or have abnormal tread wear, it should be fine. You might think about having them balanced, just in case. But if you have traveled long distance before, you should be fine. Oh, don't forget a spare (in good condition) and to have the correct lug wrenches handy.
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1999 E-350 Cub Wagon, 7.3L Power Stroke, E4OD, 3.55 
1990 E-350 Club Wagon, 7.3L IDI, E4OD, 3.54LS 
1983 F-150 2x4, 4.9L, C-6 w/GV-OD, 3.55 Farm pickup
1981 C-8000, 3208 CAT, RT-6510, Rockwell SSHD Tandems (Swap) 
1977 K100C, NTC-350, RT-1110, Tandem
1977 Transtar II, NTC-290, RT-9509 Single
1977 Transtar II, Formula 290, RT0-9513, Tandem
1974 C-750, 391CID, Clark 5 speed, Eaton 2 speed
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