My story is of an item loaded in, not strapped on.
Last year, when we were preparing to go to my high school class' 50th reunion, we decided to take the motorhome and stay overnight in the parking lot of the hall. The place was out in the country, and there seemed to be no objection.
When we got there, we found that there was an antique/used furniture/junk shop in the lower level of the same building. Grandma likes to buy pieces of furniture to refinish and either use or give away. She found a blanket chest that barely fit in through the door. (My plan B was to put it in through the flip-up emergency escape window in the bedroom.) With the slide in, the chest took all of the floor space in the living room area of our coach. We loaded the chest in just before leaving for home. Fortunately, we have a driver's door, so I could get in and out without clambering over the chest.
We got home without incident. I did some wood repair on the chest (made new trim pieces) and Grandma did her refinishing thing. She gave it to our daughter.
I reminded Grandma that she has to keep her purchases small when we are traveling in the motorhome. It's a large vehicle, but getting large items in and out is a pain.
Our "Cottage on Wheels" is a
1998 Southwind 32V on GM Chassis