Many of the wakeboard company boards fit in racks but you'll grow out of them fast. At some point you'll need to invest and get a good board you can keep growing with.

If fitting in racks is a must, here are great boards that fit: Inland Surfer 4-skim, most Phase5 other than the XL and Razz, TWP composite. A good deal on these boards is $300-500, super hard to find cheaper.

I'm 155lbs too and had a Blue Lake that I could freeride, carve, and slash all day on small wakes. I now have a big wake and got a smaller board that fits me (P5 Drew and TWP JWSM). Brand new I think the TWP composite is a fantastic price and you can get it a shade bigger for small wakes and still rip it up maybe like a 4.7 for you. Best to call a dealer for recommendations. Used boards are always great if you can find them.