I have a roof rack that works great (yakima/thule) but I can't park in any damn parking lots/garages. I'd like to put a hitch rack on but don't want to shell out $200.00 for the hitch and another $300.00-someting for a new rack. Is there a rack that already exists that I could bolt my current Thule trays onto? I'll buy the hitch part and then use something like http://www.amazon.com/gp/product/B003NBFKDK/ref=pd_lpo_k2_dp_sr_3?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B000UUK26W&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1ZKWASWWY349R378089X and bolt my Thule racks onto. That doesn't fold up, so I'd have to mod it somehow. My car is a 2001 nissan sentra. Thoughts/suggestions?