Fatears: Pennsylvania places an inspection sticker in these places as "proof":
Motor vehicles: lower left (driver's side) of the windshield.
Trailers: on the left side at the front of the unit . If there's a window in that area, it's placed there.
Motorcycles: on the rear fender (I think).
Va Budman: You can have up to three stickers in the lower left corner of your windshield in PA.
1. inspection sticker
2. emissions sticker
3. weight class sticker (if it's a weight class 2 or higher.)
Like you in VA, diesels are also exempt from emissions in PA so I only have 2 out of the 3 stickers.
1996 Ford HD F-250 SC SB PSD 5sp 4.10
2000 Jayco Eagle 266 FBS TT
1986 Coleman Laramie Pop-Up