I have a 16' tandem axle that rides pretty smooth. I installed a work bench, 2-14" pop up vents, 2-7" electric fans in the floor to keep the heat from building up, an Interstate deep cycle marine battery, alarm system, and a 100W solar panel. I installed a rack system that you can walk past the 1 side as it is easier to load bigger planes without having to go around the front to grab it while someone holds it from the rear. I used 2" upholstery foam so the planes have a comfortable ride to the field. I installed 4- 30" 12V LED interior lights that take little to no power to run. My panel will keep up with running 2 fans all day, full time alarm system and a 500W power inverter and lights at night. I also gave it a little wrap job!!