I think badbusdriver has it nailed here.
It will likely be cheaper overall to run two vehicles.
Firstly, you are not going to get a stable towcar for 2.5 tonnes that will give you 35mpg on your commute.
I have first had experience of this. Sat on my drive are three cars, where there were once two. We have had a 2015 Sorrento 2.2 diesel auto since 6 months old (current shape). It's a great car, generally very reliable but you are not going to get 35mpg day in day out. Ours has now done 70k miles, it had 1500 on it when be bought it, my wife used it as her "daily" and our caravan towcar until September last year. Yes, it will give 40mpg (just) indicated on a long run, but her 25 mile each way commute saw 33 day to day. You might do better with a manual, but if you want relaxed towing you really want an auto. No risk of ruining your clutch reversing the horsebox then either.
So, our Sorrento has been retired to long family journies/tow car duties and we bought a Nissan Leaf. See my other posts- we've now done 11k miles in it as my wife's commuter car. I looked at the maths carefully -yes there are two insurance premiums, two lots of servicing costs (although actually very minimum on the Leaf) but because of how cheap the Leaf is to run, this adds up for us.
Badbusdrivers suggestions look excellent but obviously your budget is limited. I would definitely get a Jap/Korean 4WD for your weekend duties- you want something as big and heavy as possible for your horsebox - our Sorrento would be no good, the auto is only rated to two 2000kg, you want a Shogun/Landcruiser.
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