If making reservations is stressing you out, try not making any advanced ones...maybe make the same day you need one. You own a very good boonbdocking machine so it's not a big deal if you do not find a FHU site. We try to do three months out West every other year and do not make advanced reservations. I'll have a general idea of where we are going and what NPs we want to see but weather or finding an area we really like will change our itinerary.
Our favorite CGs are USFS CGs that do not take reservations BUT do not show up Friday thinking you will find a site big enough... show up Monday and you almost have the CG to yourself as most have gone back to work. We love boondocking with our big rig as it has big tanks so going for a week does not require cutting back on anything. We have found going into a USFS CG late Sunday and leaving on Friday works the best for us. We travel, resupply, and use a Private CG (to dump) on the weekend... the exception is a long holiday weekend where we often stay put over the holiday. This past summer we went to South Lake Tahoe without reservations on Labor Day (we rarely make reservations more than on the day we might need it) and found a site in the city park BUT it was on Monday, not Friday.:S
Here is a trip report on that trip but we moved more often than normal but still without reservations.
OP, you might want to click on How it tow my Prius below.
