My puller is only a 10t capacity. Any recommendations on where to rent a 20 or 30t puller?

I have a 20t bottle jack Jeff. What sort of cross-member should I use? As in shape (box, channel, I-beam, my existing 10t beam?) and size/cross-section.

4 3/4 between the pulling bolts unfortunately. Not sure that a regular 20t jack will fit in there so it might need to be one of those pusher rams.

(note I'm not an engineer) I used an online calculator to figure out a box section that would meet a section modulus of at least six which a 10x3 section with 1/2" walls (S = 6.75) would. The beam that came with the 10t hydraulic puller is obviously a lot smaller and solid section so before I go there I'll see if any of the shops round here have something that might work. I'm also wondering if the 10t hydraulic puller from Harbor Freight is really producing the same output that my 10t bottle jack is, and to try using the bottle jack as-is with the beam to see if that moves it. I couldn't find any pressing tonnage in the serviceman's reference for either of the two clutch hubs - it just says tap the hubs while tightening. Only the sprocket seems to have a pressing tonnage.