Help with stabilizing trailer

I don't feel that the stabilizers with the single arm that comes down is as strong as the ones that are more of a scissor jack. When trailers came with the old screw jack stand style ones we used to lower the front an inch or two then set the back and then raise the front to level and then set the front ones. That took some weight off of the tires and hence a more stable platform, but with the newer built on jacks they can't handle the weight as well and will usually bend the short arm if too much weight is applied. Depending on the scissor jack it might handle more weight.
You might already be, but be sure to use your X-chalks on both sides to get the most help from them. That is about the only thing (other than the tongue jack) that gives real front to back stabilization.