dcmd_zczep(playerid, params[])
{
    #pragma unused params
    {
        new trailerid = 503;
        new vehicleid = GetPlayerVehicleID(playerid);
        AttachTrailerToVehicle(trailerid, vehicleid);
     }
    return 1;
}

// Author: l0nger
// (C) 2012-2013, <[email protected]>

#include <a_samp>

new
    g_PlayerVehicleID[MAX_PLAYERS];
    
public OnPlayerKeyStateChange(playerid, newkeys, oldkeys) {
    if(newkeys & KEY_ACTION) {
        if(!((g_PlayerVehicleID[playerid]!=INVALID_VEHICLE_ID) || (g_PlayerVehicleID[playerid]>0 && GetVehicleModel(g_PlayerVehicleID[playerid])==525))) return;
        
        new
            Float:vpos[2][3],
            iterator
        ;
        
        GetVehiclePos(g_PlayerVehicleID[playerid], vpos[0][0], vpos[0][1], vpos[0][2]);
        while(iterator<MAX_VEHICLES) {
            if(!GetVehicleModel(iterator) || iterator==g_PlayerVehicleID[playerid]) continue;
            GetVehiclePos(iterator, vpos[1][0], vpos[1][1], vpos[1][2]);
            if(
                (floatabs(vpos[0][0]-vpos[1][0])<7) && // Jedyny blad to taki, ze nie uwzglednia obrotu dwoch pojazdow (towa i docelowego)
                (floatabs(vpos[0][1]-vpos[1][1])<7) &&
                (floatabs(vpos[0][2]-vpos[1][2])<7)
            ) { 
                if(IsTrailerAttachedToVehicle(g_PlayerVehicleID[playerid])) DetachTrailerFromVehicle(g_PlayerVehicleID[playerid]);
                AttachTrailerToVehicle(iterator, g_PlayerVehicleID[playerid]);
                SendClientMessage(playerid, -1, "Podczepiono pojazd!");
                break;
            }
            iterator++;
        }
    }
}

public OnPlayerConnect(playerid) g_PlayerVehicleID[playerid]=INVALID_VEHICLE_ID;

public OnPlayerStateChange(playerid, newstate, oldstate) {
    if(newstate==PLAYER_STATE_DRIVER) g_PlayerVehicleID[playerid]=GetPlayerVehicleID(playerid);
    else g_PlayerVehicleID[playerid]=INVALID_VEHICLE_ID;
}