Where to get oil change?

We have found that the mobile services provide a very reasonable price. We always furnish the oil and filter. Most of these mobile services are wanting the business and set their prices accordingly. We have found VERY FEW places that can or will change the oil as they can't get the RV in their service bays and will not do it flat.

We changed our oil ourselves this summer while we were home and once again said never again. We just can't seem to do this job (cross members, terrible placement of drains and filter, no room above the oil filler) without making a terrible mess.