I WAS outside my one year warranty when I did the flip, but I was not to concerned about it anyways. For it to affect this they would need to be able to show and prove what was done is why the item failed. But looking at the risk of bottoming out and this damage I quickly out weighed any chance of issues with FR with the benefit of the higher ground clearance.
The actual flip was easy, it cost $20 in new axle spring hangars from the local trailer shop. Everything else was just the effort of actually getting the springs and axle re-located. The brake wires were also lengthened to allow for the slightly longer distance.
I towed several 1000 miles now (still on 14" stock tires and rims) and have had nothing but good results.
Pat, Jen & Heather... Oh yeah and our trained attack trailer cat, Cinnamon
2015 ChevyHD D-Max
2014 Greywolf 26DBH