You realize going up an inch is only a half inch extra of clearance. Even less when you air down.
You are likely much better off with good skids as well as some good train and practice. A long wheel base truck rarely get high enough unless you go real big.
You in the end will spend a fortune for little gain. Spend your money on those other things first which you will benefit for all the time,
My two cents any way...
Except I'm not going up only an inch in tire. My current tires are not 32s as they should be, they're not even 31" in diameter. I understand that I'm never going to get way up there. I'm not aiming for two feet of ground clearance here. But there are many good reasons to make the jump based on the terrain I'm traveling through.
Based on my measurements, I'll be getting an inch more clearance. That's not just under the body, it's under the axle, the front diff, everywhere. And trust me, the Frontier needs it. The larger tires also tend to smooth out the bumps in the terrain better. I don't know if you saw the pictures from my previous trail run, but I'm traveling over trails that are pretty much broken rock on top of slightly less broken rock. There aren't many smooth parts to speak of. The other advantage is the larger sidewalls that tend to flex better when run at lower pressures. That makes for a better ride too. There's also an aesthetic factor to me. It looks like I'm running around on castors right now with 3" of lift and tires that don't even measure out to 31".
I understand that the gains won't be stellar. But that's okay with me as I still think the larger tires are necessary. The other things I need to add to the truck are pretty minor to me. The skids are fairly cheap, easy to install, and quick to get once ordered. The navigation system is just gravy since I have highly detailed maps of all of Montana, Idaho, Wyoming, and Washington. Backup lights are, again, just gravy. I am not in dire need of an air compressor right now since I have a portable one. The winch and rear bumper are the only major steps coming at this point. Those will coming soon enough, and I've not yet been in a situation where either was an absolute necessity.
As mortonm has said, I am the vice president of the itchy trigger finger tire brigade. So it stands to reason that I need to make a jump soon