Following is a response from Senior DHS Stata Specialist, Tom Pullum:

Yes, you should use d005. Then I recommend that you give equal weight to each survey. There are various ways to do this, e.g. the following. Refer to the three surveys in the pooled file with survey=1, survey=2, survey=3. Calculate the sum of the DV weights in each survey as D1, D2, and D3, and the sum D=D1+D2+D3. Then in the first survey calculate the revised d005 as d005r=(d005/D1)*(D/3). In the second survey, d005r=(d005/D2)*(D/3). In the third survey, d005r=(d005/D3)*(D/3).

The following lines will accomplish this (change the paths, of course):

set more off
use e:\DHS\DHS_data\IR_files\KEIR42FL.dta, clear
keep caseid v0* d*
gen survey=1
save e:\DHS\DHS_data\scratch\KEdvtemp.dta, replace
append using e:\DHS\DHS_data\IR_files\KEIR52FL.dta
keep caseid v0* d* survey
replace survey=2 if survey==.
append using e:\DHS\DHS_data\IR_files\KEIR70FL.dta
keep caseid v0* d* survey
replace survey=3 if survey==.
drop if d005==.
summarize d005 if survey==1
scalar D1=r(N)*r(mean)
summarize d005 if survey==2
scalar D2=r(N)*r(mean)
summarize d005 if survey==3
scalar D3=r(N)*r(mean)
scalar D=D1+D2+D3
scalar list D1 D2 D3 D
gen d005r=d005*(D/3)
replace d005r=d005r/D1 if survey==1
replace d005r=d005r/D2 if survey==2
replace d005r=d005r/D3 if survey==3
summarize d005*
save, replace