I doubt the previous D-series Ju 87 could carry the 1.8t bomb, the D-5 could but only with reduced fuel (fuselage tanks only, wing tanks empty). I don't have an overload loadplan for D-1 and D-3 though.
D-1 in had a standard max takeoff weigt of 5.9t and with 1t bomb it's at 5.84t.
D-5 hat 6.3t as standard max takeoff with overload max at 6.5t, with 1.8t and reduced fuel it's at 6.48t.
Max bomb weight for D-5 within standard load conditions is 1.4t at 6.303t overall weight.