A few people I watch on Youtube also have laundromats, car washes, etc. 

Relevant questions:-Was he working Directly for the owner, or as a sub/thru someone else?

Was he looking to sell the cabin?

That being said, i would only recommend waiving inspection contingencies IF:1) you are very experienced, and have pretty much priced in all risk in your offer2) you are large enough to accept the risk, meaning you either have sufficient capital to take the loss if something comes up, or you do enough volume that one bad deal will wash out. 

Buy in this neighborhood, spend this much per square foot, wash and repeat. 

You work, they keep ALL of the money...Slavery plain and simple.Minimum wage in Wash DC is $15 an hour, for a 2000 hour year that's $30,000 a year.Even a Burger Flipper at McDonalds gets paid above Minimum Wage--but not these people.They ought to outlaw this exploitation of people--just like they outlawed having them Pick Cotton for Free.https://www.youtube.com/watch?

If the LTR rate is $1200, but the MTR rates is $1650, I'd almost think it is about a wash if you're including utilities, lawn care, and management fees, and calculate vacancy or am I missing something.   

Tenant agrees not to park and/or store any recreational vehicle, trailer, company owned vehicle, furniture, appliances or any other property on said parking space or said carport without prior written consent of Landlord.Unauthorized vehicles or vehicles parked improperly are subject to tow.Tenant agrees to follow municipal code for proper parking on the street.VEHICLE REMOVAL.Without notice and without liability, Landlord may order removal of any vehicle from any parking space or carport which is unauthorized to park on the premises, is parked illegally or which remains inoperable for a period of fourteen (14) consecutive days.Any vehicle owned by Tenant and remaining on the property after the termination of Tenant’s right to occupancy may be immediately removed by Landlord with full immunity from damages for such removal.Tenant agrees to indemnify Landlord for towing/storage costs incurred.VEHICLE WASHING AND REPAIR.Tenant agrees not to wash or repair vehicles on the premises without prior written consent of Landlord.Activities that cause excessive water runoff, a disturbance to the neighbors, or a public eyesore, will not be permitted.

I've been thinking that getting a pickup could help our landlord duties since we might have to move couches, washing machines, etc sometimes. 

I just put my old washing machine in an STR.