Hi My Name is Mary,RichM,s wife. In my opinion the Flying J's are the best showers available from the big three,Flying J,Pilot,and Petro. I think the best time frame is between 11AM and 3 PM, at that time they usually have showers available. I like the Flying J because they seem to have the most room in the showers ,then the other truck stops. However if you get out west the Little America truckstops in Arizona and Wyoming and Utah have extremely attractive facilities with bathtubs etc.Also a very good one is in Du Bois Pa
I generally always leave a small tip, about a dollar or so if the shower is up to snuff.Most of those attendants are working for minimum wage and if they do a good job should be rewarded.
As far as the truck goes I make sure we have alot of water on board ,to brush my teeth with and clean my face.We have one of those 12 volt stoves that can heat water in about 5 minutes.
We also have a small Porta Potty,the guy that I am married to does not want me walking into a truck stop in the middle of the night to use the restroom. We then empty this thing in rest areas at the RV dump or inside in a stall.
Sometimes you simply have to have a motel room for the night,the other half will complain like crazy about the cost,just IGNORE HIM. After 1 hour in the room when he is clean and dry watching a NFL game he will say ' Great idea to get this room "
Good Luck.this lifestyle has it's moments ,both positive and negative but the positives outweigh the ngeatives by a large amount..