My $0.02, I easily made a combo tool (never had time to make multiple, still owe BD Stone one) that fits into the medium flat rate long box to cut down on shipping. Has there been much interest in renting these? Why rent a 30mm deep socket when they are easily accessible, same with 32mm boxed wrench (can use large adjustable if you want to be ghetto and dirty, I did for like 8 yrs
). Those two tools add cost and weight.
If there is interest in this, I may have to step into the game, but tool rental from me would be like from Autozone and the like; you pay for the tools and if you return them you get the deposit back.