1. No
2. 2a did not have an alternator originally, so a bit hard to say. Possibly it is an S3 alternator, but could be anything. If doing a lot of driving, especially if not at night, a standard S3 alternator should work.
Dual battery setup should be easy with the S2a, so I can't see anyone laughing at you - only problem will be where to put the second battery.
3. Secure locking and fuel cap lock(s), bonnet lock. As you suggest, extra fuel tankage would be good, and the major step would be to fit the larger late S3 tank, after that a LH tank as in the army S2a. No other modifications are essential except, if it is an early one, fit a temperature gauge. There are lots of mdifications you could make, but particularly for this type of trip, there could be advantages in keeping everything as standard as possible - more likely to find parts.
4. No. Just make sure everything is in good shape - the main problem is that it is 40-50 years old.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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