I've ridden through it on a dual sport ride last year. It is very nice and in the pines. should be no problem for your trailer except a long dirt road but Rancheria road is very wide and pretty flat. I think the easiest way there is via Alta Sierra.
As for riding you'll have a lot of trouble if you're not plated. There are only so many green sticker trails, most are single track too. To connect the trails without a plate might be a challenge.
Do some seaching for more info. as I've never investigated. You might try Stewards of the Sequoia, Chris Horgan runs that organization and they do amazing work maintaining the trails around there. He might have more information or be able to steer you to some maps.
DIRT BIKES RULE
'12 Duramax CC short bed
2019 Wildcat Maxx 285RKX