new boat draft ?

so hopefully we can be upgrading our boat before next season(long time)and if been doing a lot of research and have learned almost every thing i need to know about them except one crucial thing draft. for some reason boat companys hide this even wakeboarding mag wont tell you the draft. we go to a very shallow river and i know big v-drives fit but i would like to know the draft on some boats. heres the list
1 09 tige rz2
2 09 epic 23v
3 09 tige z1
4 09 X-star
5 09 supreme 226
6 09 axis
7 09 vlx
8 09 supra 22v
9 09 X-15
10 09 tige 22ve
11 09 moomba xlv
12 09 moomba lsv
13 00 tige 21i(my current boat for comparison)

sorry if i sound demanding thanks for any help