If the Jayco rep said that the R rating of bubble wrap insulation is R14, he is either lying or doesn't know jack about insulation. It's basically a scam since it is never installed properly. Read more here
In all fairness to Jayco, I haven't seen them advertising R ratings for their RVs lately. Instead, they have been touting what temperatures the RVs can maintain inside when the RV is placed in an environmental chamber. However, I question those results since certain variables are never revealed, such as the heat source, the length of exposure, etc.
Open Range still quotes their outrageous R ratings but "qualifies" them by calling them calculated values. Even then, they are "mistaking" Assembly R Ratings for actual R ratings since foil bubble insulation is a radiant barrier and to get the full value they have to installed with a specified air gap on both sides. Otherwise, they have an R rating of less than R1.4 since heat will conduct through it instead of being reflected.