Re: Big enough trailor
My advise is be more concerned about the weight limits on the trailer. Most 16' trailers are 7K rated and a 3901 with loader and tiller weighs about 4500 lbs. Add at least another 2K for the trailer weight and you're almost at the max weight.
That said, will it fit, yes. Can you get by with a trailer that size, yes. Have I done the same thing myself, yes. Because I've been in the same situation is why I say look at the trailer specs. I had lots of times my trailer made me feel uncomfortable but just didn't know any better. Now after buying a heavier rated trailer I can see the difference plain as day.
When it comes to weight, you can haul light loads on a big trailer but you can't haul a heavy load on a small trailer. My $.02