Sensible advice smith 100s. Certainly buy as new as possible, but they stopped making them about five years ago.
However, I have been towing caravans for over 35 years. Towcars were mostly Peugeot diesels, but starting with a 1800cc Austin Maxi, then a Vauxhall Carlton estate 2.0 auto. After that a Peugeot 505 family estate 2.5 diesel then a range of 2.0 diesel Peugeot estates and a a 2.0 diesel 3008 (all manuals). The Antara SE Nav manual is the best towcar out of all of them in terms of quiet power, fuel economy and stability. The AWD facility makes a lot of difference on wet grass and grass or clinker slopes. I am sensible to the shortfalls of complex transmission systems so I try to be careful with regard to the transfer box and wheels. I bought mine in 2015 from a VX dealer, with 2500 miles on the clock, at a bargain price and took the view that it would not be used for short hops and would be serviced by Vauxhall using genuine GM parts and fluids. I never use cheap fuel, only Shell or Texaco, with a fill-up of their expensive stuff every 4/5 tanks full. Just completed a regen at 690 miles from the last one and sailed through the MOT with the original Hankook tyres, exhaust and brakes in place (45 000 miles on the clock). I find my VX dealer to be no more expensive than the man in the railway arch for servicing, but the genuine GM parts are expensive. Membership of the VX Service Club helps a lot with regard to discounts. My VX dealer has the full support and technical library of Vauxhall UK, which can be reassuring.
6th gear is a waste of time unless running downhill - it uses more fuel than 5th, whether solo or towing. Economy when towing is around 32 mpg, which is the best I have had on any car.
Towing at 55mph is very comfortable and economical. Yes, the car is noisy (it is a chain driven engine) and some of the kit is basic compared to the German things on the road, but I bought it for less than half the price of one of those and as I intend to keep it for seven years the resale price is not a major consideration. When the Antara finally gives up what will be my choices for another AWD towcar for a 1500 kg caravan? Volvo? BMW? Audi? Mitsubishi? I will need to win the Premium Bonds first for a three months old used car and all of those choices have their own problems, without being scared stiff of scratching the paintwork in a shopping mall car park or scuffing the leather with a stack of 4 x 2 timber from the DIY store. The Antara accommodates all of that and I don't lose sleep over it.
Ignore the trade reviews for the Antara - they seem to be based upon the pre-facelift models and are made by journos who are used to driving top-end vehicles with a nice lunch thrown in for good measure in the south of France. The proof of the pudding, etc. If they were still being made I would certainly consider buying another as a replacement. As for an electric towcar to pull 1500kg for 130 miles without a break - forget that for a while.
2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.