Hi Falcon, the HVT-50D is still the largest battery you can fit and still fit the cover back on.
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further UPDATE:
Have now had a chance to fit off the Traxide DBS properly using the SSB 70LD battery.
Also took the opportunity to install a 200W solar panel and Redarc SRP0240 20A solar regulator while I was at it .. along with cabling for my HF radio.
I wanted to keep the solar cabling as short as possible so elected to run the cable onto the side of the platform rack .. in through the front right rail assembly and down the inside of the 'A' pillar cover to the drivers side ABS compartment.
The regulator is sitting 'snugly' against the front edge with a couple of pieces of HD foam rubber to assist with cushioning.
Is the factory low coolant alarm not good enough? Has always worked a treat for me
Umm yeah. The D4 has a very effective low coolant alarm built in.