I honestly would expect just that on trade in. Your color is somewhat uncommon and your miles seem about right. The only downfall your going to have right now is the season. Now I live in Michigan so seasons effect trade in values a lot here. If you are more south than I wouldn't worry as much. If it were me, I would most likely gain ~$2,000 on trade during the spring.
2008 Pontiac G8 GT (MGM, Premium Package) - 20% Tint, Cora’s Catback, Cortex RF 93 Oct Tune, GXP Diffuser, GXP Brembos, MS Camaro Rims, Escort 9500ix
2018 Toyota 4Runner TRD Off-Road Premium DD - Not Stock
2019 RAM 1500 Big Horn - Other half's DD