that is fine as long as the vehicle can pull and stop the weight, but we need to think about the trailer, specifically the axle and the tires and think about what they are rated to carry. do you know what the rating of the axle is? i doubt the trailer manufacturer put a 3500lb axle on a trailer originally designed to carry less than 2500lbs. did you upgrade the tires to carry that load? are you still running 4.80x12 tires? assuming you have the highest rating on a 4.80 tire, they're only rated for 990lbs per tire, or 1980lbs total trailer weight. even if you're running 5.30x12 load range C they're rated 1045lbs per tire or 2090lbs total trailer weight at 60 psi. even those white 5-lug wheels are only rated to carry 1250lbs each, so to go to 3000lbs total trailer weight you'll even need heavier duty wheels, and then you'll need to have ST145r12 tires to be rated for 3000lbs total trailer weight on a single axle. in order to get to the 3500lb total trailer weight you're talking about on a single axle, you'll have to upgrade your wheel/tire package to a 14" setup, as well as upgrade the axle and hubs to suit the extra weight.
this stuff while its not fun to think about, can be the difference between a fun weekend on the water and 10k worth of skis scattered across the highway.