Help with flipping axles

I know a lot of you toy hauler guys have raised there trailers by flipping axles or building up the spring blocks.
Can somebody please recommend and good place to take my trailer to have this done in the Riverside Ca. area?
I just got a 2017 Ford F350 and it's a lot taller than my 2008. I'm not sure I can even back under it with the way the trailer is now at level.
Its crazy how high these new trucks are.

Thanks for any help.
Joe A