My Margay Inginte K3 is 78" long, 25" tall, & 52" wide (depending on track settings). It go up to 54". I was wondering all this when I was looking for trailers. Ended up settling on a 5x8 Bravo Hero enclosed trailer. The only issue with getting the kart in was the rear track with is about 52" and the door opening is 51". You can go to the trailer manufacturing and have the door widened for a few extra $$ and longer lead time. I went for the option of getting trailer tires for the kart of the kart and now it goes right into the trailer with no twisting or struggling. With the setup I have now, I can get the kart in&out of the trailer and put in it on the kart stand by myself. It’s pretty handy when no one is around to help out.
You can following along with my trailer build here.
https://forums.kartpulse.com/t/storing-and-transporting-kart-and-tires-in-the-trailer/1976/11