I highly suggest not crossing straps... worst way to tie down. You lost a strap the remaining strap will send the vehicle sideways...
Also, go weigh your Jeep, I almost guarantee it will be heavier than you think.
Personally, I think you're cutting it too close, and I wouldn't be at all surprised if you're actually overweight. don't forget the weight of food, clothes, bedding, sundries, and all that other stuff we put in and carry around in our campers all the time. Also don't forget the weight of your recovery gear, tools etc. that you carry in the Jeep in addition to the addons.
Best suggestion, go weight the Jeep with full fuel tank, normal gear loadout. Now go weigh your trailer with it loaded as it would be during use as well and use real numbers. I'd bet money the real numbers don't match up with the paper numbers.