December 18 should be fine for awhile, 5 year replacement interval is generally recommended. If you want to upgrade get ST (special trailer) tires. I recommend load range D. 190's have a pretty heavy axle load. E's are the highest but have really stiff sidewalls so can be overkill.
Speed rating should be J (62 m/h), L (75 m/h) or m (81 m/h) depending on how you drive. Unless you're a speed demon towing the m's are overkill too. Forget all terrain, that just increases rolling resistance and tire wear. They're not drive wheels. I'm personally fine with Chinese tires as long as they are properly rated. That's what I run and I haven't had any problems.