[Misiur]

Hm, do you get the "wrong truck" error even at first truck? If yes

pawn Код:

if(PlayerInfo[playerid][pDeliveryVeh] != GetPlayerVehicleID(playerid))

//To

if(-1 != PlayerInfo[playerid][pDeliveryVeh] && PlayerInfo[playerid][pDeliveryVeh] != GetPlayerVehicleID(playerid))

I can see bright future ahead of you if you call yourself a beginner - apart from minor stuff it's nicely planned and written