Yes, you can get a lot of house for the money, depending on if you live in Boise or one of the bedroom communities like Meridian. Meridian has a really nice dump station at the city sanitation plant. A lot of RV'ers in this area so there are a lot that head to the hills in almost any direction come weekends. On holiday weekends, the transportation department sets up flaggers at the intersection of the Banks/Lowman Highway and Highway 55 because of the volume of campers. We've never had to deal with it because we leave camp by 7am to head down the mountain and always beat the flaggers and traffic. Depending on how adventuresome you are, you can camp late into the Fall and early Winter. We boondock sometimes close, along the Middle Fork of the Payette river north of Crouch and Garden Valley and a lot of people ATV up there. There are several campgrounds on the Middle Fork but it may be tight for your Raptor.
As for the road to Bull Trout/Martin Lake - the highway is good, some 6% grades and winding but do-able. The two mile road back into the CG also is good with spots wide to move over if you encounter anyone.
As with any rig our (and yours) size, you pick and choose your CG's and boondocking sites, but we have never NOT found a spot. As for Bull Trout, you'll want to be in the Martin Lake section for your rig.