(edit didn't see your post before this- I see you have a bit of rough angle in your own driveway - well, go ahead, I don't think it would be a big deal and might look cool)
If it ain't broke, why fix it? are you off-roading with the trailer? Compared to some others I've seen my 27BH has good clearance. I'd try it for a few months like it is. You may not need to do anything.
Raising it may give more clearance, but it also may affect stability around corners as the center of gravity is raised, more wind tippyness I'd guess.
I have heard of popup folks doing axle flips, for going off road and because the tires are so small, using bigger wheels. I guess that's where you're getting the idea? I've not seen a TT with axle flip yet, but you could do it and let us know how it goes!
BTW, your TV sounds very adequate
My Tundra is the small v8 rated at 8000lbs or thereabouts, although I will say those "ratings" pre-2010ish I heard were by the MFG's calculations, which were for marketing purposes, somewhat dubious in some cases. My 2010 Tundra they actually recalled the truck to put different stickers (with lower figures) and new trucks use a SAE standard for towing which is usually lower. That said, sounds like you have more than enough TV capacity which is good and your PU was nearly the same weight more or less. I wish I had a bit more umph on mine, but I can deal with it and take trips about 60-65 which is comfortable for the powertrain.