if i hadnt bought this 08'..ide give u the 15k easy...
my old truck was a 2000 ext cab,i had about 13k in after market mods,suspension/paint /system/22's.it was a cammed 5.3
i paid 14k for the truck back in 02',,sold it for 10k
so yea thats when i found out cant always get what u put in it,,,thats nothin dealer denied it cause of the air ride lol,another dealer only offered 2k trade in lol.so i was ok with the 10k.
well good luck to u man,that is a sweet truck.and thats one of my favorite vids when u raced that L,,haha.