I'll show you what I use on almost every pull that needs a puller. It's old and slow like Cow mentioned earlier, but there are workarounds to speed things up and make things easier. If your not doing big pulls on every job this is another way to go, for a lot less cost and bulk.
Years ago with a partner we bought a smaller boom puller without any accessories, like your getting ready to do. Every time we tried to use it we would damage the enclosures or the piping. I hated it, until I looked up the accessories. I didn't want a pipe adapter required for every pipe size, and different pulling setup, but they had a clamp on model that would work on all pipe sizes. When we got that, things got a lot better. Then I learned better, how to work with it in many various situations.
Well that was many years ago. When I went solo it was time to procure another unit, just like you are. I shopped around and got a used kit from a tool dealer, with the gang box. It's a full kit, but still didn't suit my needs most times, and there's a lot of bulk to haul around, similar to what a cart puller requires.
I wanted a small clamp on head, like I used to have, that suits the machine work I normally do. One day driving down the road I saw a small rope sheave laying in the road, likely fell off of some utility truck. Stopped and picked it up to make myself the head attachment, like I wanted. It needed to fit 1-1/2 to 4" for my work. So from memory I fabricated one up like the one I had used previously. The sheave is small and fits in much tighter areas than the ones that came with my kit.
I took a decent look online at photos and couldn't find one of the old Greenlee models like we had, so I went in the back and snapped some photos of the custom creation, to give you the idea. Never did make time to paint it, and have used it for years. Shame on me.
To avoid pulling the wire assembly around that small sheave, and damaging it, I make an extension to the pipe run for the length of conductor I need for termination. Most jobs just need a 30º or 45º bend to get you outside of the enclosure, and whatever length you need. I now have a collection of extensions that I reuse on projects, stored in a barrel.
The thing I like about this setup is it's compact and portable. One man can move and set it up. It can be setup just about anywhere, and extended with pipe for whatever length the job requires with some rigid. I have even used it set up in a manlift for some ceiling pull boxes that needed splicing.
Most setups I screw a rigid coupling on the conduit connector in the panel or box, add a set screw connector for an EMT extension. Bend up an extension piece to suit the job at hand, and set up the puller as required. I put a rigid nipple at the end of the extension to clamp my angle head to so it don't crush and come loose during the pull. Depending on the extension length needed, it may need a temporary support for the weight of the assembly and the wire.
When the pull arrives at the end of the extension, I stop there, and remove the setup. Slide the extension off of the conductors, train the conductors to where they need to go, and button up the run.
Here's an example of a setup about 15' above the floor for an isolation transformer for a machine load.
Some 2" EMT with 3#/0 AWG about a 150' run, no muss no fuss and no skinned insulation.
