[tucsonjwt]

I recall seeing utility company trucks in the 70s with stepside and the type of cap you are describing. So, I say it is doable, but I don't know if you have a true stepside cap. This sounds extreme, but getting a fleetside shortbed and replacing your stepside would not be too difficult. You can still find square shortbed trucks in the desert southwest. In fact, I would just get another truck if it is really important to you and sell your current truck for good $$. An 8 foot bed would be much better for what you have in mind.