Comfort in a Defender is very much a personal thing - I think it depends on what shape you (and your wife) are. Noise levels are higher than a Disco, and your wife may find it a bit high off the ground to get into without steps, and the finish is spartan compared to a Disco or any "car". But I drove my 110 to Perth and back from Eastern Australia in November, covering 10,000km in three weeks, without feeling uncomfortable, several times spending twelve hours in a day sitting in it.
The one thing you need to consider, in my view is size and turning circle. The 110 is about the limit for easy parking - the extra 17" wheelbase and longer overhang on the 130 mean it will not fit in a lot of parking spaces, and the space between rows in many car parks means taking two goes to get into the spaces.
Also, the height means you have to watch clearance heights - with the 110 you need 2.05m on standard tyres and suspension, the 130 is slightly higher.
I can't comment on the specific ease of towing with the Tdi, except to point out both trailers you mention are well within manufacturer's and legal limits.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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