i think this thread is wandering a bit, discos, rangies, 90s and 110s will all pull and control his towing needs better than a standard 2.25 petrol or diesel 88 or 109 in this day and age
the risk of brakes being unbalanced on a modern motor are far slimmer than the old drum brakes and need less frequent maintenance
the modern engines produce more power enabling standing starts easier and not quite so slow hill climbs
30 years ago the traffic levels were no where near as heavy as now and forty to fifty years ago we could all happily play football in the street, this meant that a slow moving Series towing a heavy trailer wasn't too much of a problem, my dad used to tow heavy trailers and stuff behind his '52 Series 1 in the late 60s, 11" brakes and a 3litre sixpot under the bonnet so he had the power and emptyish roads (he did get stuck on a humpback bridge though, 'twas 7 ton of military trailer wouldn't follow him over

)
nowadays it would be risking dodgy overtakes, no allowances for your poor stopping distances and road rage in most of the UK, who doesn't get miffed stuck behind a caravan ??
unless the guy lives way out in the sticks up the north of Scotland i really don't see a standard 88" Series as sensible, plus he better like performing maintenance