enum vEnum
{
	bool:vTrailer,
	vObject,
	vBase
}
new vInfo[MAX_VEHICLES][vEnum];

CMD:trailer(playerid,params[])
{
	new Float:x,Float:y,Float:z,Float:r;
	GetPlayerPos(playerid,x,y,z);
	GetPlayerFacingAngle(playerid,r);
	CreateTrailer(x,y,z,r);
	return 1;
}

CMD:attach(playerid,params[])
{
	new Float:x,Float:y,Float:z;
	for(new i = 0; i < MAX_VEHICLES; i++)
	{
	    if(!GetVehicleModel(i)) continue;
	    GetVehiclePos(i,x,y,z);
	    if(IsPlayerInRangeOfPoint(playerid,10,x,y,z))
	    {
			if(vInfo[i][vTrailer] != true) continue;
			AttachTrailerToVehicle(i,GetPlayerVehicleID(playerid));
	        return 1;
		}
	}
	return 1;
}

stock CreateTrailer(Float:x,Float:y,Float:z,Float:r,attach = INVALID_VEHICLE_ID)
{
	new i = GetFreeVehicleID();
	vInfo[i][vTrailer] = true;
	vInfo[i][vBase] = CreateVehicle(606,x,y,z,r,-1,-1,-1); // Create the base of the caravan
	vInfo[i][vObject] = CreateObject(3171,0,0,0,0,0,180); // Create the caravan object to attach to the base
	AttachObjectToVehicle(vInfo[i][vObject],vInfo[i][vBase],0.00724,-1.84854,-0.96500,0,0,180);
	if(attach != INVALID_VEHICLE_ID) AttachTrailerToVehicle(vInfo[i][vBase],attach);
	return 1;
}

stock GetFreeVehicleID()
{
	for(new i = 1; i < MAX_VEHICLES; i++) if(!GetVehicleModel(i)) return i;
	return INVALID_VEHICLE_ID;
}