3.5 ton horsebox With day living

2013 reg with around 76000 ish miles. It has emergency removable breast bar, high fully removable partition, tack locker, hob, sink, wardrobe, reverse and horse camera. Were told the payload is around 1200kg but never had it checked as I only use for ponies. I had new tyres put on in 2020 and it’s done very few miles since. I will get exact dimensions as the horse are is very light and large. in Ivybridge Devon.