Myujth

I'm traveling alone from terminal 4 with 3 suitcases and will arrive at terminal 4 drop off in a taxi. Are there trolleys available in the area where the taxi stops? I'm a little worried on how I'm going to move my luggage from the forecourts to the check-in desk if there are no trolley at the forecourt.

Trolleys are generally available throughout the departure concourses and at the drop offs.

Additionally you can always pay a porter to do so, just a little more expensive but more convenient in some situations.

Baggage trolleys are provided for your use free of charge in key areas
around the terminal buildings.

Arriving passengers will find plenty of trolleys in baggage reclaim,
and these can be taken to the car park, bus station or rail station
access points.

Trolleys are also provided on the departures concourse. Please note
that they can't be taken through security control.

and

Heathrow Porters are available to manage light, bulky, heavy or
multiple items of luggage within the airport. Our Porters are
stationed ready to help you on the terminal forecourts in departures
or in the baggage hall in arrivals, alternatively you can pre-book
their services online, by email or phone, bookings must be made no
later than 48 hours before travel.