Any launch but 1 will serve you fine putting a pontoon on the water. However, launch 2 & 4 and, as Mopar says, the Marina will pose no problem.
Launch 3 does have shallow water so watch your prop til to get center field or a bit more west of the dock.
Some food for thought, the lake looks a bit above normal pool at the present time. (subject to change without notice) Launch one is a bit easier while the water is in the woods.
Good times & tight lines.
PS... Save me some fish, I'll be there just as soon as the new boat registration, some dummy forgot to apply for, arrives. Stupid boat registration!!!😣
Alert: Rt 173 north of Sandy Lake may be closed due to bridge replacement. May want to check with PennDot.