We have scissors stairs but our truck is too high up for them. I was thinking step stool but didn't take into account the handle thing at the back. Last time out we used a couple of cinder blocks...
Traci, We use an adjustable aerobic step. It's lightweight and stores conveniently at the door when the slide is in. We just pull it out and adjust it to the needed height. It has a rubber top so it's nonslip and the dogs can get in and out more safely. Just make sure you have it clicked in place.
I feel good that it's getting used for something. Climbing in and out is sort of aerobic...right?
Look around at garage sales, or used gym equipment places to make it a better value.