Any companies out there willing to hire someone that can't climb into a trailer?

I would suggest a ladder. I pull an end dump but there are time I have to get in the trailer, how ever there is what they call a "Man door" built into the front of the trailer. Another thing is IF you have a actual certified disability the company has to provide accommodations.

 

I worry that if this is your starting point getting into this industry , you will go downhill pretty fast.
It is amazing hard on your body to sit ten hours a day where you cant get up ever little while and walk around. Fitness and obesity problems loom large in trucking. Whatever health problems you have now are only going to get much much worse once you get your CDL.
Not trying to pop your balloon but you need to really take stock before you make this leap.

 

Light weight aluminum ladder can solve that problem.
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Also, try knee compression sleeves. They're good for older people with weak knees or arthritic knees. Google "Knee Support Sleeve". I wore one on my left knee for a couple months and now don't need it anymore.
This one shows "Advanced Knee Brace & Support"

Dozens of brands to choose from.

 

Wasn’t sure if you’re a refresher trainee or if that specific company ‘trains’ everyone. But if you have recent experience, GP Transco doesn’t require it. For practical reasons, it’s a helpful ability, but most warehouses make accommodations for occasional strapping. I just know the company itself doesn’t have any kind of physical tests for it. They also give out a helper strap to all new hires, so I’m sure this is a situation they’ve seen before. I never used the strap... I just assume leave a door closed to pull myself up one step and then scoot my way in.

 

Compression socks help for weak or painful ankles.
Amazon has a large selection of these.

 

I don’t see how the job is possible without getting in and out of the trailer. A ladder may work from a practical perspective, but that would likely be considered a disability from an employers perspective.

 

It would be difficult to inspect and secure a load without getting inside. Once I’m empty the trailer gets swept, blown, or scrubbed /moped. Each and every time. Washout places aren’t everywhere or always open. Your customer expects their load to carried in a clean trailer and be properly secured. They are paying for that. Anything less and you are cheating the customer. You serve the customer, not yourself.

 

You'd love the dedicated account I'm on. In the year I've been on it, I haven't climbed into a trailer once. The loads are sealed both directions. But, my company is one that requires you to demonstrate the ability to climb into a trailer during training/orientation.

 

I’m not expected to climb up into the back of a trailer. I grab two pickups, then, drop & hook on the other end. If I need to get in the back, I can walk right on from the shippers’ docks. We have some big boys that drive for us. It’s everything they can do to get up into their cabs. Guaranteed, they’re not climbing up into any trailer.

You just need to find the right fit, jobwise.