There’s a QuikTrip and a Sinclair on Front Street. Both pretty scuzzy. There’s a Pilot on Kansas Ave. near AG, and a QuikTrip up the road from that. Both fill up fast. Other than that options are few and far between. There’s also a 7-11 in Olathe with truck parking, that’s usually a cluster as well because there’s a Tyson right around the corner. North of town in Kearney there’s a Pilot. And on Hwy 210 there’s also a Pilot, this too has limited parking. The casino across the street tho is almost a guarantee for a spot, however. Also there’s a casino at I-29 and front street but I’ve never been in there. I know they advertise truck parking tho. Best of luck to you!