Had a "board buddy" on another board install those stick-on gadgets on his RV - making great claims as to their advertised and anticipated benefits. No followup info from him on them and their "benefits" - and, strangely, when he later got another RV, those stick-ons were conspicuous by their absence...
John Day....|'88 Winnebago Super Chief 27ft. Class A
Eastern .....|'88 KIT model 240 24 ft. 5er
Oregon ......|'02 Dodge/Cummins 2500 Quad Cab