Did you bother to read the link in post #6??? You are not listening to the advice from people who have lifted and wheeled their rigs for years.
Air shocks are for hauling and street queens, not jeeps. They are not for lifts, springs are.
You can use shackles and risk fatiguing worn leaf packs, AAL and risk sagging in a year, Bastard packs and do a bit better than most AAL, or buy a proper lifting full leaf pack. You have choices, air shocks and lift block spacers are not them.
'00 XJ Sport, White - almost done for now...
'11 Town and Country - people mover :-(
'88 XJ Up Country, '01 XJ Sport, '08 KK Limited, '98 XJ Parts Donor, '07 XK Limited (the Stall-ander)