The official BLM brochure I picked up at the campground states. "RVs longer than 23' are not recommended." I'll upload a picture of it.

When we were there there was a guy with a 30ft trailer in, probably what was the only site that could accommodate it. The whole park is twisty and tight, with no options to back out if you decide it’s not going to work. On the way out there is a dip that our low clearance vehicle had to switch back on, in order not to bottom out. I think we just barely made it. The park is incredible though!!

IF you go to the web page you will find this: "Due to safety precautions for vehicles, the recommended max length for RVs is 23 feet." That is a DIRECT copy and paste from this page: https://www.blm.gov/visit/aguirre-spring-campground

Perhaps in theory but I wouldn't recommend it. Look at the photos uploaded by other users. One photo of a placard says not recommended for trailers over 23 ft long.

Yes you can but the road is winding.

It's a wonderful little campground (a real gem) but not very RV friendly. Most sites were designed for walk-in tent camping. The parking spots vary somewhat but most are short and not very level. I've successfully camped in a 13' trailer after getting creative with extra leveling boards.

Most of the sites are small and not easily accessed with larger rigs, however there are roadside sites that are available for larger rigs and few regular site that you certainly could use. Don’t get there late, they lock the gate at closing time and have exit only over one way road spikes.

I wouldn't recommend it.

The sites aren't that big. My 23' TT had limited options. And the road up is steep and curvy, not conducive to big rigs.

The road to the campground is narrow, steep and winding.

You are welcome to try. The road in is narrow, steep and winding for about five miles. The road out is the same. We saw several large trailers and motor homes while we were there. My twenty two foot trailer was about all that I wanted to pull up there.