I picked up a combination ladder. It's lightweight and built well. Can open up as regular ladder with 4 feet on the ground or turned into an extension ladder with 2 feet on the ground. I use the extension to lean against my RV to tilt the solar panels (put cut up pool noodles on the ends). The length of mine is just perfect, it fits across the full width of the under storage unit with only a 1/2 inch to spare. I don't have to strap it to my ladder and have it go missing.
Similar to this one but I picked one up on sale for just over $100 Cdn.
https://www.canadiantire.ca/en/pdp/m...1072p.html#srp