Advice and insurance

Hey everyone, I just wanted to put a post up asking advice on two matters. Currently I am an hgv driver doing arctic work around the north and south of Ireland. All multi drop deliveries in a daf cf. I am an avid horse owner for my sins and want a horse lorry, I was thinking of buying a standard box lorry and having it converted and have found a 2004 daf lf 45.150 with 190km , my first question is you opinions on this choice and mileage at a price of 2.8k. My second question is insurance, I live in Northern Ireland and am struggling to get a quote…forgot to mention I’m 23 (im v lucky to get a job) does anyone have any ideas on companies that would insure such a vehicle that is unlikely to do anymore than 2000km per year?