Leveling Kit for Yukon AT4 XL?

Has anyone put a leveling kit on their at4 Yukon xl? If so what brand ?
Thanks in advance
Was about to start my own thread with the same question. Did you ever figure anything out?
How about after market air shocks for Yukon AT-4? Do they make any compatible with AT-4? Dealer says none mde by GMC. I pull a 34 ft TT and have a slight squat
 

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