We had a site reserved on the Aspen loop and cancelled it after we saw how tight it was. We ended up boondocking at Long Jim Loop which was quite nice.

I wouldn't try it. Very tight in many spots.

I don't think so. Lots of tight turns with trees that have been hit more than once. Check out the boondocking options.

No, don’t try. Signage at entrance states 30’ max. We went in with a 29’ MH and barely fit in one spot that was very narrow

The trailer max is 30 ft. There is an RV park right next to Mather. It is operated by Delaware North co. Link is available on the NPS site.

The max RV length at Mather Campground is 30'.