I've done some rv leveling in the past. If you do end up looking into it further the best thing is to have blocking put between the top of the leaf spring shackles and the bottom of the trailer frame. You can then gusset the add in piece to take away the side to side stress from the axle. But I would say the setup you have now will work fine. The only concern you might have is some extra weight has been shifted to the back axle with the nose higher. You might want to keep an eye on the back bearings and check that they are not over heating but again they should be fine with that small change in the ride height. Most of the rv's that I have seen lifted needed at minimum 6" and I have seen some lifted as much as 10" (which is way too much in my opinion).
Me, the wife, three kids (Son, 9 yr old & twin 5 yr old girls)
2013 Ford F-150 FX4 5.0L 4X4 3.55
2012 Jayco Jayfeather 228