I too have a Harbor Freight Hi-volume 12vdc air compressor, actually two of them. However you have to be careful as there are two that look identical to the VIAIR.
Make sure you buy the 150psi model(35a fuse), it works very well and really fast blowing up my motorhome tires to 90psi.
The other model I believe is only good to 100psi and since it is working at full output heats up and oftentimes the 30 amp fuse blows.
Regarding your statement "can all Saturns be flat towed"
A few years ago a new model Saturn was introduced from Europe. Initially it was declared to be flat towable and then Saturn sent a special bulletin to dealers advising them it was not.
P.S. It was called ASTRA
This is for Road Princess. I suggest you re-check the California DMV statutes with respect to a towed vehicle, viz:
California Vehicle Code Division 12 - Equipment of Vehicles
Chapter 3. Brakes
Article 2. Operation of Brakes
Control and Stopping Requirements
26454. (a) The service brakes of every motor vehicle or combination of vehicles shall be adequate to control the movement of and to stop and hold such vehicle or combination of vehicles under all conditions of loading on any grade on which it is operated.
(b) Every motor vehicle or combination of vehicles, at any time and under all conditions of loading, shall, upon application of the service brake, be capable of stopping from an initial speed of 20 miles per hour according to the following requirements:
Maximum Stopping Distance (feet)
(1) Any passenger vehicle 25
(2) Any single motor vehicle with a manufacturer's gross vehicle weight rating of less than 10,000 lbs. 30
(3) Any combination of vehicles consisting of a passenger vehicle or any motor vehicle with a manufacturer's gross vehicle weight rating of less than 10,000 lbs. in combination with any trailer, semitrailer or trailer coach 40
(4) Any single motor vehicle with a manufacturer's gross vehicle weight rating of 10,000 lbs. or more or any bus 40
(5) All other combinations of vehicles 50
* The bracketed information has been added editorially to meet accessibility requirements and is not part of statute.
Amended Ch. 443, Stats. 1965. Effective September 17, 1965.
Braking System: Towing Vehicles
26458. (a) The braking system on every motor vehicle used to tow another vehicle shall be so arranged that one control on the towing vehicle shall, when applied, operate all the service brakes on the power unit and combination of vehicles when either or both of the following conditions exist:
(1) The towing vehicle is required to be equipped with power brakes.
(2) The towed vehicle is required to be equipped with brakes and is equipped with power brakes.
(b) Subdivision (a) shall not be construed to prohibit motor vehicles from being equipped with an additional control to be used to operate the brakes on the trailer or trailers.
(c) Subdivision (a) does not apply to any of the following combinations of vehicles, if the combination of vehicles meets the stopping distance requirements of Section 26454:
(1) Vehicles engaged in driveaway-towaway operations.
(2) Disabled vehicles, while being towed.
(3) Towed motor vehicles.
(4) Trailers equipped with inertially controlled brakes which are designed to be applied automatically upon breakaway from the towing vehicle and which are capable of stopping and holding the trailer stationary for not less than 15 minutes.
Amended Ch. 121, Stats. 1991. Effective January 1, 1992.
If you wish to go to Astoria from Port Angeles I would suggest that you take 101 to 108 to 8 to 107 then back on 101.
I drive this route twice a year going to and from the Oregon coast and it is an excellent route. Not much traffic and I usually drive at 55mph.
This is for "roadglide".
You are right about there being a very steep grade when leaving Crescent City in California, but your sense of direction is wrong. The steep grade is south of Crescent City on the way to Arcata / Eureka, not north on the way to Smith River or Brookings/Harbor.