at the proper length while forming a bight denoted generally 11 4 for embracing a suitable seat frame member those of skill in the art will recognize that a wide variety of adjustable strap designs exists many of which could be employed alternatively with equal effectiveness referring now to fig9 and fig1 in an alternative embodiment where no suitable seat component is available for strap engagement on the vehicle 39 s windows side a plurality of sidewall anchor tabs denoted 15 similar or identical to floor tab 8 is affixed to the vehicle sidewall to which hitch strap 1 6 w is then linked an adjustable strap of any conventional design may be employed for this connection such as the double buckle strap depicted in fig9 denoted generally 14 metal carabiners denoted 16 similar or identical to carabiner 5 link strap 14 to hitch strap 1 6 w proximally and to sidewall tabs 15 distally this arrangement is shown in fig1 referring to fig1 14 an alternative embodiment employs a second method of securing base cell 1 to the vehicle sidewall whereby in lieu of hitch strap 1 6 w some or all reinforcement straps 1 5 t which terminate on the windows side are extended with a depending looped end a carabiner denoted 17 similar or identical to carabiner 4 links each such end loop to an instance of the aforesaid adjustable strap 10 in the foregoing embodiment where no seat component is available for.