IN GENERAl, only vehicles "engaged in commerce" under 26,000 pound gross vehicle weight, or any vehicle over that weight, must stop. Even though the Penske truck is technically a "commercial vehicle", unless you are renting it to DO commerce, (and moving your personal goods ISN'T commerce - moving merchandise is...), and UNLESS your vehicle is capable of AND taxed/tagged to operate at a weight of 26,001 pounds or more (which would require a commercial driver's license, as well....) you SHOULD be OK skipping it - barring any freaky state requirement out of line with any place I've ever driven one. YMMV...