You have to define "legal", but it looks like you only weighed your truck on the one set of scales and the trailer on another set of scales.. There should have been 3 scales you weigh on.. You put your front axle on 1, rear axle on another and the trailer on the 3rd set..
But, if it was a semi truck scale, you might not have enough length for all of that, so.....
But, it looks to me your truck weighed in at #7400 which is more than #6900 so YOU decide.. ;)
You may or may not be over the rear axle weight rating, but my guess is you are probably over by a tad.. Again, your choice on if that's okay for you or not..
If you are good with the way it tows, then you can factor that into your choice too..
If it was me.... I would not tow that size trailer with your truck (or my truck for that matter), but that's just me and has no bearing on anything.. :)
Good luck!
Mitch