Are we saying larger sailplanes require larger tow vehicles?

Smaller sailplanes (Russia, PW5) require smaller tow vehicles?

You can buy new "small" trucks for $15 K. Large trucks/SUV near $25
K.

If this is part of the equation, the "old" used ships (which tend to
be very heavy) look even less practical then the new, small planes.

Performance difference? Maybe the "old" gliders have better L/D, but
the new, small sailplanes (Russia, PW5) have better climb. Both can
go cross-country.

John