Yes, but only via HS1/CTRL
Ripple lane exchange sidings will be more than sufficient for the volume of cargo being shipped between Tilbury and the Channel Tunnel. In fact, a headshunt would probably be overkill.
Apologies for being late to the party, I don't normally come on this part of the forum.
Are you a fan of light rail Bald Rick?
This question raises a big red flag for me - is this project about serving a transport need or about building a light rail system because trams are great?
Just think about the supermarket distribution hubs locally... their goods mostly coming from DPW & PoT... Tesco on the north shore and Sainsbury's on the south... Littlebrook site will also become a logistics hub... they will need links across the river for various reasons. Tram minimodal is an opportunity that can support this sector.
This isnt about removing 'all' HGV shipments, its about a pragmatic approach to what suits local business need with an aim of HGV reduction. The map above will evolve as the area around it develops.
Its scope is much more than Grays to Gravesend.
There might be scope for individual high-value packages (such as shop-to-shop transfer between Lakeside and Bluewater) to go by tram minimodal (in the same way GWR used to take consignments from Cornwall to London in HST Guard's vans) but isn't 99% of the logistics business in that area about big bulk flows? The Orion-type theory of an EMU of parcels into a city centre station only really works, well, in the city centre. I don't know the area dynamics overly well but the rail dynamics of the area are for bulk flows heading to Wembley or Acton yard and beyond, with nothing really transferring from Kent to Essex by rail. How many HGVs are crossing the Dartford crossing that aren't using the M2/20 or M11?
Although part of me would love to see some swapbodies on a trailer behind a tram. It'd be a wonderful photo.
AFAICT, your main market is that which is currently served by the Gravesend Ferry. It's a very expensive tunnel for people to seek employment in warehouse handling jobs - I've no doubt it'd be handy for those who would use it but it isn't going to be cheap. For comparison the recent Tideway Sewer (7m diameter so reasonably close approximation) cost £4.3bn for 25km - that's £172m/km, so your tunnel is probably looking at £200m alone.
The population density of Thurrock, Gravesham & Dartford is already close to that of Croydon... Its about time we had public transport that supported that!
Croydon doesn't have a half-mile-wide river through the middle of it. This argument is like saying that Liverpool's traffic is just as bad as Manchester's and so it should have an orbital motorway that runs over the Irish Sea.