All these 'too high' answers don't know unless they've actually weighed each axle separately. They're just guessing. Don't guess. Most people don't have enough knowledge of the topic to even have a clue about what to guess about.
If you want to know for sure run it across a scale that has a split platform. I had access to a split platform scale when I helped a buddy set up his 5er. His was about 200 lbs more on the rear axle for every 2" we raised the front. If yours scales out the same that would be 400 lbs which is no big deal.
With just 400 lbs difference you should be more concerned that you have enough clearance between the 5er and bed of your truck. 400 lbs isn't going to cause a blow out. 4" of clearance could cause you 5er and truck damage.