We have installed a whole house electric monitoring system, eliminating the need to carry and instal the extra "pigtail" and worrying about it being stolen. Don't know what brand and in storage so cannot look. Had it two years and to date, it has only shut the power down once and we were glad it did. When the RV park checked the power post, they found it had a problem and moved us.
We installed flow through Tire Minders on all 7 tires (including spare) and love knowing PSI and temp at the flick of a switch. However there are some problems.
1.) The front ones are kind of tucked under the hub cap and it needs to be removed to add air. At first we carried the necessary tools. Now we just go to a tire service center. If there is a Costco in the area, you can pull up to their tire service bays and they will take care of it. Most filling stations will loan you the crow bar and rubber mallet.
2.) Just after they were installed and we were in rout to Alaska, the weight of the flow through valves pulled the brackets off the hubcaps. The brackets were only attached with two little rivets. The temporary solution was to screw and super glue the brackets back into place then tape them with gorilla tape. Solution held strong for over 5,000 miles. Permanent solution is to find a really good welder and have the brackets welded to the hub caps....as they should have been in the first place. It was done this spring and we have traveled about 4,500 miles and they are holding strong.
3.) Sometimes the batteries shake loose and you get a no signal. First few times we panicked. Some times the battery will reseat by itself. Sometimes it has to be done....which is another nuisance when it is a front tire.
4.) The people at Tire Minder are wonderful to work with and they will take all the time necessary to walk you through installation or problem resolution. HOWEVER, they do not have extended office hours, are located in Florida and are closed holidays, weekends, and when a hurricane blows through.
Sorry this is so long.