You picked a good place to stop, that's for sure!
The strap placement is a great idea, I'll use that if you don't mind.
Trailer looks like it was built for your P5, very cool.
What is that on the passenger side firewall? Looks like a heater...
if so, how well does it work?
I works pretty well, not so efficient like on P700 and up. But it helps in the winter with doors on and insulation mod I do.
I've tried couple heaters and aquahot is the best to me ( summit racing is good , but P500 does not make enough heat and I badly needed to save under hood space)
This is heater thread P500 - P500 Summit heater install