The west Memphis area would be a super hub of truck activity. Thanks for clarifying what you meant about Robin Hood Hills.
40 and 55 coss each other right in west Memphis where currently there are 4 truck stops in a cluster at that intersection. It is a very busy intersection of interstates linking together. The memphis area itself is a huge activity hub for interstate commerce. You have in the area, just to name a few, FedEx, who brings a huge amount of business via truck and air, you have a few rail yards where containers are brought in and put onto chassis and delivered to many of the warehouses in the not just local area but surrounding businesses. You have a lot of companies who have warehouses in the area to ship from (think regional hubs to be able to deliver product faster to the consumer) Fred's dollar store has a lot of business in the area, there is Nike, Kroger, as well as computer manufacturer warehouses, and video game maker warehouses. These are just a few examples, as there are literally thousands of warehouses and manufacturers in the metro and surrounding areas. And let's not forget about the river, a lot of things are moved via the mighty Mississippi river.
Memphis is unique in a way as many forms of transportation are used in the area. You will see dry van's, refrigerated trailers, flat beds, rail containers, car haulers, bulk grain and bulk liquid trailers. Also memphis has a petroleum hub where tanker trucks load up full of fuel and deliver to the surrounding areas with gasoline of different grades and diesel fuel. I've often wondered just how many tractor trailers are in Memphis at any given time. Literally if a crime is committed by a long haul truck driver it's a needle in a haystack because of the population at any given hour of truckers in the metro area.
Memphis is a dangerous city! Anything one would want can be found there. Prostitution, strip bars, drugs, gangs, human trafficking, culture, history, economic diversity, education opportunities, and jobs. Just a little ways south you have a plethora of casino action, and dog races right there in the west Memphis area. One can go to Memphis for a variety of reasons. There are 2 children's hospitals, and many medical specialist in the area that bring people near and far. You have the scene downtown for entertainment. Also downtown is the bus station which is very shady to go to. There as well as other places you will find a lot of transient activity.