I had aluminum cabinets put in mine and at 22' and 8' wide works great with the car, fuel jugs, racing jack, tools, lubricants, cleaning supplies, ect.
I have a friend who has a 20' trailer without the cabinets and it works fine. I like the 8' wide trailer with the Cobra, some like the 8 1/2' wide. Most people I know use the 24, 22, or 20. There is not alot of difference in price from a 22 to 24. The 22 backs better than the 24 and the 20 is better than both.
The rest depends on you. That's my preference. If you go below 20' be prepared to back the car in the trailer if you have the FE engine. Balance means alot and under 20' it's harder to do.
