chairs

code/modules/vehicles/interior/interactable/seats.dm

@@ -327,6 +327,7 @@
 	var/mob_old_x = 0
 	var/buckle_offset_y = 0
 	var/mob_old_y = 0
+	var/allways_undense = FALSE
 
 /obj/structure/bed/chair/vehicle/Initialize()
 	. = ..()
@@ -384,24 +385,34 @@
 		if(buckle_offset_y != 0)
 			M.pixel_y = mob_old_y
 			mob_old_y = 0
-
-	for(var/obj/structure/bed/chair/vehicle/VS in get_turf(src))
-		if(VS != src)
-			//if both seats on same tile have buckled mob, we become dense, otherwise, not dense.
-			if(buckled_mob)
-				if(VS.buckled_mob)
-					REMOVE_TRAIT(buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
-					REMOVE_TRAIT(VS.buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
+	if(allways_undense)
+		ADD_TRAIT(buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
+	else
+		for(var/obj/structure/bed/chair/vehicle/VS in get_turf(src))
+			if(VS != src)
+				//if both seats on same tile have buckled mob, we become dense, otherwise, not dense.
+				if(buckled_mob)
+					if(VS.buckled_mob)
+						REMOVE_TRAIT(buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
+						REMOVE_TRAIT(VS.buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
+					else
+						ADD_TRAIT(buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
 				else
-					ADD_TRAIT(buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
-			else
-				if(VS.buckled_mob)
-					ADD_TRAIT(VS.buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
-				REMOVE_TRAIT(M, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
-			break
+					if(VS.buckled_mob)
+						ADD_TRAIT(VS.buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
+					REMOVE_TRAIT(M, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
+				break
+
+
 
 	handle_rotation()
 
+/obj/structure/bed/chair/vehicle/unbuckle()
+	if(buckled_mob && buckled_mob.buckled == src)
+		REMOVE_TRAIT(buckled_mob, TRAIT_UNDENSE, DOUBLE_SEATS_TRAIT)
+	. = ..()
+
+
 //attack handling
 
 /obj/structure/bed/chair/vehicle/attack_alien(mob/living/user)

code/modules/vehicles/van/rt01.dm

@@ -321,6 +321,7 @@
 
 /obj/structure/bed/chair/vehicle/comfy
 	icon = 'icons/obj/vehicles/interiors/rt01_general.dmi'
+	allways_undense = TRUE
 
 /obj/structure/bed/chair/vehicle/comfy/alt
 	icon_state = "alt_vehicle_seat"